Scale back the traits

3 files changed, 3061 insertions, 245 deletions

diff --git a/crates/ra_syntax/src/ast.rs b/crates/ra_syntax/src/ast.rs
index 1ac0201b813..ab0f44dd2e0 100644
--- a/crates/ra_syntax/src/ast.rs
+++ b/crates/ra_syntax/src/ast.rs
@@ -11,10 +11,7 @@ pub mod make;
 use std::marker::PhantomData;
 
 use crate::{
-    syntax_node::{
-        NodeOrToken, SyntaxElement, SyntaxElementChildren, SyntaxNode, SyntaxNodeChildren,
-        SyntaxToken,
-    },
+    syntax_node::{SyntaxNode, SyntaxNodeChildren, SyntaxToken},
     SmolStr, SyntaxKind,
 };
 
@@ -33,24 +30,16 @@ pub use self::{
 /// conversion itself has zero runtime cost: ast and syntax nodes have exactly
 /// the same representation: a pointer to the tree root and a pointer to the
 /// node itself.
-pub trait AstNode: AstElement {
+pub trait AstNode {
     fn can_cast(kind: SyntaxKind) -> bool
     where
         Self: Sized;
 
-    fn cast_or_return(syntax: SyntaxNode) -> Result<Self, SyntaxNode>
-    where
-        Self: Sized;
-
     fn cast(syntax: SyntaxNode) -> Option<Self>
     where
-        Self: Sized,
-    {
-        <Self as AstNode>::cast_or_return(syntax).ok()
-    }
+        Self: Sized;
 
     fn syntax(&self) -> &SyntaxNode;
-    fn into_syntax(self) -> SyntaxNode;
 }
 
 #[test]
@@ -59,51 +48,22 @@ fn assert_ast_is_object_safe() {
 }
 
 /// Like `AstNode`, but wraps tokens rather than interior nodes.
-pub trait AstToken: AstElement {
+pub trait AstToken {
     fn can_cast(token: SyntaxKind) -> bool
     where
         Self: Sized;
 
-    fn cast_or_return(syntax: SyntaxToken) -> Result<Self, SyntaxToken>
-    where
-        Self: Sized;
-
     fn cast(syntax: SyntaxToken) -> Option<Self>
     where
-        Self: Sized,
-    {
-        <Self as AstToken>::cast_or_return(syntax).ok()
-    }
+        Self: Sized;
 
     fn syntax(&self) -> &SyntaxToken;
-    fn into_syntax(self) -> SyntaxToken;
 
     fn text(&self) -> &SmolStr {
         self.syntax().text()
     }
 }
 
-/// Like `AstNode`, but wraps either nodes or tokens rather than interior nodes.
-pub trait AstElement: std::fmt::Display {
-    fn can_cast_element(kind: SyntaxKind) -> bool
-    where
-        Self: Sized;
-
-    fn cast_or_return_element(syntax: SyntaxElement) -> Result<Self, SyntaxElement>
-    where
-        Self: Sized;
-
-    fn cast_element(syntax: SyntaxElement) -> Option<Self>
-    where
-        Self: Sized,
-    {
-        <Self as AstElement>::cast_or_return_element(syntax).ok()
-    }
-
-    fn syntax_element(&self) -> NodeOrToken<&SyntaxNode, &SyntaxToken>;
-    fn into_syntax_element(self) -> SyntaxElement;
-}
-
 /// An iterator over `SyntaxNode` children of a particular AST type.
 #[derive(Debug, Clone)]
 pub struct AstChildren<N> {
@@ -132,64 +92,6 @@ fn children<P: AstNode + ?Sized, C: AstNode>(parent: &P) -> AstChildren<C> {
     AstChildren::new(parent.syntax())
 }
 
-/// An iterator over `SyntaxToken` children of a particular AST type.
-#[derive(Debug, Clone)]
-pub struct AstChildTokens<N> {
-    inner: SyntaxElementChildren,
-    ph: PhantomData<N>,
-}
-
-impl<N> AstChildTokens<N> {
-    fn new(parent: &SyntaxNode) -> Self {
-        AstChildTokens { inner: parent.children_with_tokens(), ph: PhantomData }
-    }
-}
-
-impl<N: AstToken> Iterator for AstChildTokens<N> {
-    type Item = N;
-    fn next(&mut self) -> Option<N> {
-        self.inner.by_ref().filter_map(|x| x.into_token()).find_map(N::cast)
-    }
-}
-
-fn child_token_opt<P: AstNode + ?Sized, C: AstToken>(parent: &P) -> Option<C> {
-    child_tokens(parent).next()
-}
-
-fn child_tokens<P: AstNode + ?Sized, C: AstToken>(parent: &P) -> AstChildTokens<C> {
-    AstChildTokens::new(parent.syntax())
-}
-
-/// An iterator over `SyntaxNode` children of a particular AST type.
-#[derive(Debug, Clone)]
-pub struct AstChildElements<N> {
-    inner: SyntaxElementChildren,
-    ph: PhantomData<N>,
-}
-
-impl<N> AstChildElements<N> {
-    fn new(parent: &SyntaxNode) -> Self {
-        AstChildElements { inner: parent.children_with_tokens(), ph: PhantomData }
-    }
-}
-
-impl<N: AstElement> Iterator for AstChildElements<N> {
-    type Item = N;
-    fn next(&mut self) -> Option<N> {
-        self.inner.by_ref().find_map(N::cast_element)
-    }
-}
-
-#[allow(dead_code)]
-fn child_element_opt<P: AstNode + ?Sized, C: AstElement>(parent: &P) -> Option<C> {
-    child_elements(parent).next()
-}
-
-#[allow(dead_code)]
-fn child_elements<P: AstNode + ?Sized, C: AstElement>(parent: &P) -> AstChildElements<C> {
-    AstChildElements::new(parent.syntax())
-}
-
 #[test]
 fn test_doc_comment_none() {
     let file = SourceFile::parse(
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index 0c339b9879d..385fddc89ee 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -1,11 +1,3037 @@
 //! Generated file, do not edit by hand, see `xtask/src/codegen`
 
+#[allow(unused_imports)]
 use crate::{
-    ast::{self, AstChildren, AstNode},
+    ast::{self, AstChildren, AstNode, AstToken},
+    NodeOrToken, SyntaxElement,
     SyntaxKind::{self, *},
-    SyntaxNode,
+    SyntaxNode, SyntaxToken,
 };
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Semi {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Semi {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Semi {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SEMI => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Comma {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Comma {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Comma {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            COMMA => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LParen {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LParen {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LParen {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            L_PAREN => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RParen {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RParen {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RParen {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            R_PAREN => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LCurly {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LCurly {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LCurly {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            L_CURLY => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RCurly {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RCurly {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RCurly {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            R_CURLY => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LBrack {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LBrack {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LBrack {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            L_BRACK => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RBrack {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RBrack {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RBrack {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            R_BRACK => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LAngle {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LAngle {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LAngle {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            L_ANGLE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RAngle {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RAngle {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RAngle {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            R_ANGLE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct At {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for At {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for At {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Pound {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Pound {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Pound {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            POUND => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Tilde {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Tilde {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Tilde {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            TILDE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Question {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Question {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Question {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            QUESTION => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Dollar {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Dollar {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Dollar {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DOLLAR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Amp {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Amp {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Amp {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AMP => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Pipe {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Pipe {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Pipe {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PIPE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Plus {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Plus {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Plus {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PLUS => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Star {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Star {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Star {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            STAR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Slash {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Slash {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Slash {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SLASH => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Caret {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Caret {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Caret {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CARET => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Percent {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Percent {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Percent {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PERCENT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Underscore {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Underscore {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Underscore {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            UNDERSCORE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Dot {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Dot {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Dot {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DOT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Dotdot {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Dotdot {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Dotdot {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DOTDOT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Dotdotdot {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Dotdotdot {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Dotdotdot {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DOTDOTDOT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Dotdoteq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Dotdoteq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Dotdoteq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DOTDOTEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Colon {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Colon {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Colon {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            COLON => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Coloncolon {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Coloncolon {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Coloncolon {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            COLONCOLON => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Eq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Eq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Eq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            EQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Eqeq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Eqeq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Eqeq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            EQEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct FatArrow {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for FatArrow {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for FatArrow {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            FAT_ARROW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Excl {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Excl {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Excl {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            EXCL => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Neq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Neq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Neq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            NEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Minus {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Minus {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Minus {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MINUS => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ThinArrow {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ThinArrow {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ThinArrow {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            THIN_ARROW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Lteq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Lteq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Lteq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            LTEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Gteq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Gteq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Gteq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            GTEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Pluseq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Pluseq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Pluseq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PLUSEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Minuseq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Minuseq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Minuseq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MINUSEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Pipeeq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Pipeeq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Pipeeq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PIPEEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Ampeq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Ampeq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Ampeq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AMPEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Careteq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Careteq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Careteq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CARETEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Slasheq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Slasheq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Slasheq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SLASHEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Stareq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Stareq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Stareq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            STAREQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Percenteq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Percenteq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Percenteq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PERCENTEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Ampamp {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Ampamp {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Ampamp {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AMPAMP => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Pipepipe {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Pipepipe {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Pipepipe {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PIPEPIPE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Shl {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Shl {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Shl {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SHL => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Shr {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Shr {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Shr {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SHR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Shleq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Shleq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Shleq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SHLEQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Shreq {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Shreq {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Shreq {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SHREQ => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct AsKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for AsKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for AsKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AS_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct AsyncKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for AsyncKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for AsyncKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            ASYNC_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct AwaitKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for AwaitKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for AwaitKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AWAIT_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct BoxKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for BoxKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for BoxKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            BOX_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct BreakKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for BreakKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for BreakKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            BREAK_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ConstKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ConstKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ConstKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CONST_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ContinueKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ContinueKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ContinueKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CONTINUE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct CrateKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for CrateKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for CrateKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CRATE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct DynKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for DynKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for DynKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DYN_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ElseKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ElseKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ElseKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            ELSE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct EnumKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for EnumKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for EnumKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            ENUM_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ExternKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ExternKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ExternKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            EXTERN_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct FalseKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for FalseKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for FalseKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            FALSE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct FnKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for FnKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for FnKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            FN_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ForKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ForKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ForKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            FOR_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct IfKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for IfKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for IfKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            IF_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ImplKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ImplKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ImplKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            IMPL_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct InKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for InKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for InKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            IN_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LetKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LetKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LetKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            LET_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LoopKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LoopKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LoopKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            LOOP_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct MacroKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for MacroKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for MacroKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MACRO_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct MatchKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for MatchKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for MatchKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MATCH_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ModKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ModKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ModKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MOD_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct MoveKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for MoveKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for MoveKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MOVE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct MutKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for MutKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for MutKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            MUT_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct PubKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for PubKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for PubKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            PUB_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RefKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RefKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RefKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            REF_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ReturnKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ReturnKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ReturnKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            RETURN_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct SelfKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for SelfKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for SelfKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SELF_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct StaticKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for StaticKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for StaticKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            STATIC_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct StructKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for StructKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for StructKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            STRUCT_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct SuperKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for SuperKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for SuperKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SUPER_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TraitKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for TraitKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for TraitKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            TRAIT_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TrueKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for TrueKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for TrueKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            TRUE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TryKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for TryKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for TryKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            TRY_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct TypeKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for TypeKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for TypeKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            TYPE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct UnsafeKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for UnsafeKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for UnsafeKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            UNSAFE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct UseKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for UseKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for UseKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            USE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct WhereKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for WhereKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for WhereKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            WHERE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct WhileKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for WhileKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for WhileKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            WHILE_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct AutoKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for AutoKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for AutoKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            AUTO_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct DefaultKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for DefaultKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for DefaultKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            DEFAULT_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ExistentialKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ExistentialKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ExistentialKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            EXISTENTIAL_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct UnionKw {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for UnionKw {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for UnionKw {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            UNION_KW => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct IntNumber {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for IntNumber {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for IntNumber {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            INT_NUMBER => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct FloatNumber {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for FloatNumber {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for FloatNumber {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            FLOAT_NUMBER => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Char {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Char {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Char {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CHAR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Byte {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Byte {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Byte {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            BYTE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct String {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for String {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for String {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            STRING => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RawString {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RawString {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RawString {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            RAW_STRING => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ByteString {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for ByteString {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for ByteString {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            BYTE_STRING => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RawByteString {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RawByteString {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RawByteString {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            RAW_BYTE_STRING => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Error {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Error {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            ERROR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Ident {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Ident {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Ident {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            IDENT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Whitespace {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Whitespace {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Whitespace {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            WHITESPACE => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Lifetime {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Lifetime {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Lifetime {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            LIFETIME => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Comment {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Comment {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Comment {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            COMMENT => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct Shebang {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for Shebang {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for Shebang {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            SHEBANG => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct LDollar {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for LDollar {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for LDollar {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            L_DOLLAR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct RDollar {
+    pub(crate) syntax: SyntaxToken,
+}
+impl std::fmt::Display for RDollar {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        std::fmt::Display::fmt(&self.syntax, f)
+    }
+}
+impl AstToken for RDollar {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            R_DOLLAR => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxToken) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxToken {
+        &self.syntax
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct SourceFile {
     pub(crate) syntax: SyntaxNode,
 }
diff --git a/xtask/src/codegen/gen_syntax.rs b/xtask/src/codegen/gen_syntax.rs
index c730c75eed0..2dfb6837187 100644
--- a/xtask/src/codegen/gen_syntax.rs
+++ b/xtask/src/codegen/gen_syntax.rs
@@ -97,11 +97,13 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
         let name = format_ident!("{}", to_pascal_case(kind_str));
         quote! {
             #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-            pub struct #name(SyntaxToken);
+            pub struct #name {
+                pub(crate) syntax: SyntaxToken,
+            }
 
             impl std::fmt::Display for #name {
                 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-                    std::fmt::Display::fmt(self.syntax(), f)
+                    std::fmt::Display::fmt(&self.syntax, f)
                 }
             }
 
@@ -112,29 +114,10 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
                         _ => false,
                     }
                 }
-                fn cast_or_return(syntax: SyntaxToken) -> Result<Self, SyntaxToken> {
-                    if Self::can_cast(syntax.kind()) { Ok(Self(syntax)) } else { Err(syntax) }
-                }
-                fn syntax(&self) -> &SyntaxToken { &self.0 }
-                fn into_syntax(self) -> SyntaxToken { self.0 }
-            }
-
-            impl AstElement for #name {
-                fn can_cast_element(kind: SyntaxKind) -> bool {
-                    match kind {
-                        #kind => true,
-                        _ => false,
-                    }
-                }
-                fn cast_or_return_element(syntax: SyntaxElement) -> Result<Self, SyntaxElement> {
-                    if Self::can_cast_element(syntax.kind()) { Ok(Self(syntax.into_token().unwrap())) } else { Err(syntax) }
-                }
-                fn syntax_element(&self) -> NodeOrToken<&SyntaxNode, &SyntaxToken> {
-                    NodeOrToken::Token(&self.0)
-                }
-                fn into_syntax_element(self) -> SyntaxElement {
-                    NodeOrToken::Token(self.0)
+                fn cast(syntax: SyntaxToken) -> Option<Self> {
+                    if Self::can_cast(syntax.kind()) { Some(Self { syntax }) } else { None }
                 }
+                fn syntax(&self) -> &SyntaxToken { &self.syntax }
             }
         }
     });
@@ -156,28 +139,21 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
                 FieldSrc::Optional(ty) | FieldSrc::Many(ty) => ty,
                 FieldSrc::Shorthand => name,
             };
-            let element_kinds = &element_kinds_map.get(*ty).unwrap_or_else(|| panic!("type not found: {}", *ty));
-            let iter = if !element_kinds.has_tokens {
-                format_ident!("AstChildren")
-            } else if !element_kinds.has_nodes {
-                format_ident!("AstChildTokens")
-            } else {
-                format_ident!("AstChildElements")
-            };
+
             let ty = format_ident!("{}", ty);
 
             match field {
                 FieldSrc::Many(_) => {
                     quote! {
-                        pub fn #method_name(&self) -> #iter<#ty> {
-                            #iter::new(&self.syntax)
+                        pub fn #method_name(&self) -> AstChildren<#ty> {
+                            AstChildren::new(&self.syntax)
                         }
                     }
                 }
                 FieldSrc::Optional(_) | FieldSrc::Shorthand => {
                     quote! {
                         pub fn #method_name(&self) -> Option<#ty> {
-                            #iter::new(&self.syntax).next()
+                            AstChildren::new(&self.syntax).next()
                         }
                     }
                 }
@@ -203,29 +179,10 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
                         _ => false,
                     }
                 }
-                fn cast_or_return(syntax: SyntaxNode) -> Result<Self, SyntaxNode> {
-                    if Self::can_cast(syntax.kind()) { Ok(Self { syntax }) } else { Err(syntax) }
+                fn cast(syntax: SyntaxNode) -> Option<Self> {
+                    if Self::can_cast(syntax.kind()) { Some(Self { syntax }) } else { None }
                 }
                 fn syntax(&self) -> &SyntaxNode { &self.syntax }
-                fn into_syntax(self) -> SyntaxNode { self.syntax }
-            }
-
-            impl AstElement for #name {
-                fn can_cast_element(kind: SyntaxKind) -> bool {
-                    match kind {
-                        #kind => true,
-                        _ => false,
-                    }
-                }
-                fn cast_or_return_element(syntax: SyntaxElement) -> Result<Self, SyntaxElement> {
-                    if Self::can_cast_element(syntax.kind()) { Ok(Self { syntax: syntax.into_node().unwrap() }) } else { Err(syntax) }
-                }
-                fn syntax_element(&self) -> NodeOrToken<&SyntaxNode, &SyntaxToken> {
-                    NodeOrToken::Node(&self.syntax)
-                }
-                fn into_syntax_element(self) -> SyntaxElement {
-                    NodeOrToken::Node(self.syntax)
-                }
             }
 
             #(#traits)*
@@ -238,71 +195,16 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
 
     let enums = grammar.enums.iter().map(|en| {
         let variants = en.variants.iter().map(|var| format_ident!("{}", var)).collect::<Vec<_>>();
-        let element_kinds = &element_kinds_map[&en.name.to_string()];
         let name = format_ident!("{}", en.name);
-        let kinds = en.variants
+        let kinds = variants
             .iter()
-            .map(|name| {
-                element_kinds_map[*name].kinds.iter().collect::<Vec<_>>()
-            })
+            .map(|name| format_ident!("{}", to_upper_snake_case(&name.to_string())))
             .collect::<Vec<_>>();
         let traits = en.traits.iter().map(|trait_name| {
             let trait_name = format_ident!("{}", trait_name);
             quote!(impl ast::#trait_name for #name {})
         });
 
-        let all_kinds = &element_kinds.kinds;
-
-        let specific_ast_trait = if element_kinds.has_nodes != element_kinds.has_tokens {
-            let (ast_trait, syntax_type) = if element_kinds.has_tokens {
-                (
-                    quote!(AstToken),
-                    quote!(SyntaxToken),
-                )
-            } else {
-                (
-                    quote!(AstNode),
-                    quote!(SyntaxNode),
-                )
-            };
-
-            quote! {
-                impl #ast_trait for #name {
-                    fn can_cast(kind: SyntaxKind) -> bool {
-                        match kind {
-                            #(#all_kinds)|* => true,
-                            _ => false,
-                        }
-                    }
-                    #[allow(unreachable_patterns)]
-                    fn cast_or_return(syntax: #syntax_type) -> Result<Self, #syntax_type> {
-                        match syntax.kind() {
-                            #(
-                            #(#kinds)|* => #variants::cast_or_return(syntax).map(|x| #name::#variants(x)),
-                            )*
-                            _ => Err(syntax),
-                        }
-                    }
-                    fn syntax(&self) -> &#syntax_type {
-                        match self {
-                            #(
-                            #name::#variants(it) => it.syntax(),
-                            )*
-                        }
-                    }
-                    fn into_syntax(self) -> #syntax_type {
-                        match self {
-                            #(
-                            #name::#variants(it) => it.into_syntax(),
-                            )*
-                        }
-                    }
-                }
-            }
-        } else {
-            Default::default()
-        };
-
         quote! {
             #[derive(Debug, Clone, PartialEq, Eq, Hash)]
             pub enum #name {
@@ -319,48 +221,34 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
 
             impl std::fmt::Display for #name {
                 fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-                    match self {
-                        #(
-                        #name::#variants(it) => std::fmt::Display::fmt(it, f),
-                        )*
-                    }
+                    std::fmt::Display::fmt(self.syntax(), f)
                 }
             }
 
-            #specific_ast_trait
-
-            impl AstElement for #name {
-                fn can_cast_element(kind: SyntaxKind) -> bool {
+            impl AstNode for #name {
+                fn can_cast(kind: SyntaxKind) -> bool {
                     match kind {
-                        #(#all_kinds)|* => true,
+                        #(#kinds)|* => true,
                         _ => false,
                     }
                 }
-                #[allow(unreachable_patterns)]
-                fn cast_or_return_element(syntax: SyntaxElement) -> Result<Self, SyntaxElement> {
-                    match syntax.kind() {
+                fn cast(syntax: SyntaxNode) -> Option<Self> {
+                    let res = match syntax.kind() {
                         #(
-                        #(#kinds)|* => #variants::cast_or_return_element(syntax).map(|x| #name::#variants(x)),
+                        #kinds => #name::#variants(#variants { syntax }),
                         )*
-                        _ => Err(syntax),
-                    }
+                        _ => return None,
+                    };
+                    Some(res)
                 }
-                fn syntax_element(&self) -> NodeOrToken<&SyntaxNode, &SyntaxToken> {
+                fn syntax(&self) -> &SyntaxNode {
                     match self {
                         #(
-                        #name::#variants(it) => it.syntax_element(),
-                        )*
-                    }
-                }
-                fn into_syntax_element(self) -> SyntaxElement {
-                    match self {
-                        #(
-                        #name::#variants(it) => it.into_syntax_element(),
+                        #name::#variants(it) => &it.syntax,
                         )*
                     }
                 }
             }
-
             #(#traits)*
         }
     });
@@ -380,7 +268,7 @@ fn generate_ast(kinds: KindsSrc<'_>, grammar: AstSrc<'_>) -> Result<String> {
         #[allow(unused_imports)]
         use crate::{
             SyntaxNode, SyntaxToken, SyntaxElement, NodeOrToken, SyntaxKind::{self, *},
-            ast::{self, AstNode, AstToken, AstElement, AstChildren, AstChildTokens, AstChildElements},
+            ast::{self, AstNode, AstToken, AstChildren},
         };
 
         #(#tokens)*