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-rw-r--r--compiler/rustc_expand/src/base.rs95
-rw-r--r--compiler/rustc_expand/src/build.rs218
-rw-r--r--compiler/rustc_expand/src/expand.rs122
-rw-r--r--compiler/rustc_expand/src/module.rs3
-rw-r--r--compiler/rustc_expand/src/placeholders.rs68
-rw-r--r--compiler/rustc_expand/src/proc_macro.rs3
-rw-r--r--compiler/rustc_expand/src/stats.rs3
7 files changed, 262 insertions, 250 deletions
diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index 1a9832b2fe2..c234aa43c09 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -7,7 +7,6 @@ use std::rc::Rc;
 use std::sync::Arc;
 
 use rustc_ast::attr::{AttributeExt, MarkedAttrs};
-use rustc_ast::ptr::P;
 use rustc_ast::token::MetaVarKind;
 use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::visit::{AssocCtxt, Visitor};
@@ -45,11 +44,11 @@ use crate::stats::MacroStat;
 // to use `assign_id!`
 #[derive(Debug, Clone)]
 pub enum Annotatable {
-    Item(P<ast::Item>),
-    AssocItem(P<ast::AssocItem>, AssocCtxt),
-    ForeignItem(P<ast::ForeignItem>),
-    Stmt(P<ast::Stmt>),
-    Expr(P<ast::Expr>),
+    Item(Box<ast::Item>),
+    AssocItem(Box<ast::AssocItem>, AssocCtxt),
+    ForeignItem(Box<ast::ForeignItem>),
+    Stmt(Box<ast::Stmt>),
+    Expr(Box<ast::Expr>),
     Arm(ast::Arm),
     ExprField(ast::ExprField),
     PatField(ast::PatField),
@@ -141,28 +140,28 @@ impl Annotatable {
         }
     }
 
-    pub fn expect_item(self) -> P<ast::Item> {
+    pub fn expect_item(self) -> Box<ast::Item> {
         match self {
             Annotatable::Item(i) => i,
             _ => panic!("expected Item"),
         }
     }
 
-    pub fn expect_trait_item(self) -> P<ast::AssocItem> {
+    pub fn expect_trait_item(self) -> Box<ast::AssocItem> {
         match self {
             Annotatable::AssocItem(i, AssocCtxt::Trait) => i,
             _ => panic!("expected Item"),
         }
     }
 
-    pub fn expect_impl_item(self) -> P<ast::AssocItem> {
+    pub fn expect_impl_item(self) -> Box<ast::AssocItem> {
         match self {
             Annotatable::AssocItem(i, AssocCtxt::Impl { .. }) => i,
             _ => panic!("expected Item"),
         }
     }
 
-    pub fn expect_foreign_item(self) -> P<ast::ForeignItem> {
+    pub fn expect_foreign_item(self) -> Box<ast::ForeignItem> {
         match self {
             Annotatable::ForeignItem(i) => i,
             _ => panic!("expected foreign item"),
@@ -176,7 +175,7 @@ impl Annotatable {
         }
     }
 
-    pub fn expect_expr(self) -> P<ast::Expr> {
+    pub fn expect_expr(self) -> Box<ast::Expr> {
         match self {
             Annotatable::Expr(expr) => expr,
             _ => panic!("expected expression"),
@@ -412,37 +411,37 @@ macro_rules! make_stmts_default {
 /// methods are spliced into the AST at the callsite of the macro.
 pub trait MacResult {
     /// Creates an expression.
-    fn make_expr(self: Box<Self>) -> Option<P<ast::Expr>> {
+    fn make_expr(self: Box<Self>) -> Option<Box<ast::Expr>> {
         None
     }
 
     /// Creates zero or more items.
-    fn make_items(self: Box<Self>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
+    fn make_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::Item>; 1]>> {
         None
     }
 
     /// Creates zero or more impl items.
-    fn make_impl_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_impl_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         None
     }
 
     /// Creates zero or more impl items.
-    fn make_trait_impl_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_impl_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         None
     }
 
     /// Creates zero or more trait items.
-    fn make_trait_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         None
     }
 
     /// Creates zero or more items in an `extern {}` block
-    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[P<ast::ForeignItem>; 1]>> {
+    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::ForeignItem>; 1]>> {
         None
     }
 
     /// Creates a pattern.
-    fn make_pat(self: Box<Self>) -> Option<P<ast::Pat>> {
+    fn make_pat(self: Box<Self>) -> Option<Box<ast::Pat>> {
         None
     }
 
@@ -454,7 +453,7 @@ pub trait MacResult {
         make_stmts_default!(self)
     }
 
-    fn make_ty(self: Box<Self>) -> Option<P<ast::Ty>> {
+    fn make_ty(self: Box<Self>) -> Option<Box<ast::Ty>> {
         None
     }
 
@@ -521,38 +520,38 @@ macro_rules! make_MacEager {
 }
 
 make_MacEager! {
-    expr: P<ast::Expr>,
-    pat: P<ast::Pat>,
-    items: SmallVec<[P<ast::Item>; 1]>,
-    impl_items: SmallVec<[P<ast::AssocItem>; 1]>,
-    trait_items: SmallVec<[P<ast::AssocItem>; 1]>,
-    foreign_items: SmallVec<[P<ast::ForeignItem>; 1]>,
+    expr: Box<ast::Expr>,
+    pat: Box<ast::Pat>,
+    items: SmallVec<[Box<ast::Item>; 1]>,
+    impl_items: SmallVec<[Box<ast::AssocItem>; 1]>,
+    trait_items: SmallVec<[Box<ast::AssocItem>; 1]>,
+    foreign_items: SmallVec<[Box<ast::ForeignItem>; 1]>,
     stmts: SmallVec<[ast::Stmt; 1]>,
-    ty: P<ast::Ty>,
+    ty: Box<ast::Ty>,
 }
 
 impl MacResult for MacEager {
-    fn make_expr(self: Box<Self>) -> Option<P<ast::Expr>> {
+    fn make_expr(self: Box<Self>) -> Option<Box<ast::Expr>> {
         self.expr
     }
 
-    fn make_items(self: Box<Self>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
+    fn make_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::Item>; 1]>> {
         self.items
     }
 
-    fn make_impl_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_impl_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         self.impl_items
     }
 
-    fn make_trait_impl_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_impl_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         self.impl_items
     }
 
-    fn make_trait_items(self: Box<Self>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         self.trait_items
     }
 
-    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[P<ast::ForeignItem>; 1]>> {
+    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::ForeignItem>; 1]>> {
         self.foreign_items
     }
 
@@ -563,13 +562,13 @@ impl MacResult for MacEager {
         }
     }
 
-    fn make_pat(self: Box<Self>) -> Option<P<ast::Pat>> {
+    fn make_pat(self: Box<Self>) -> Option<Box<ast::Pat>> {
         if let Some(p) = self.pat {
             return Some(p);
         }
         if let Some(e) = self.expr {
             if matches!(e.kind, ast::ExprKind::Lit(_) | ast::ExprKind::IncludedBytes(_)) {
-                return Some(P(ast::Pat {
+                return Some(Box::new(ast::Pat {
                     id: ast::DUMMY_NODE_ID,
                     span: e.span,
                     kind: PatKind::Expr(e),
@@ -580,7 +579,7 @@ impl MacResult for MacEager {
         None
     }
 
-    fn make_ty(self: Box<Self>) -> Option<P<ast::Ty>> {
+    fn make_ty(self: Box<Self>) -> Option<Box<ast::Ty>> {
         self.ty
     }
 }
@@ -608,8 +607,8 @@ impl DummyResult {
     }
 
     /// A plain dummy expression.
-    pub fn raw_expr(sp: Span, guar: Option<ErrorGuaranteed>) -> P<ast::Expr> {
-        P(ast::Expr {
+    pub fn raw_expr(sp: Span, guar: Option<ErrorGuaranteed>) -> Box<ast::Expr> {
+        Box::new(ast::Expr {
             id: ast::DUMMY_NODE_ID,
             kind: if let Some(guar) = guar {
                 ast::ExprKind::Err(guar)
@@ -624,12 +623,12 @@ impl DummyResult {
 }
 
 impl MacResult for DummyResult {
-    fn make_expr(self: Box<DummyResult>) -> Option<P<ast::Expr>> {
+    fn make_expr(self: Box<DummyResult>) -> Option<Box<ast::Expr>> {
         Some(DummyResult::raw_expr(self.span, self.guar))
     }
 
-    fn make_pat(self: Box<DummyResult>) -> Option<P<ast::Pat>> {
-        Some(P(ast::Pat {
+    fn make_pat(self: Box<DummyResult>) -> Option<Box<ast::Pat>> {
+        Some(Box::new(ast::Pat {
             id: ast::DUMMY_NODE_ID,
             kind: PatKind::Wild,
             span: self.span,
@@ -637,23 +636,23 @@ impl MacResult for DummyResult {
         }))
     }
 
-    fn make_items(self: Box<DummyResult>) -> Option<SmallVec<[P<ast::Item>; 1]>> {
+    fn make_items(self: Box<DummyResult>) -> Option<SmallVec<[Box<ast::Item>; 1]>> {
         Some(SmallVec::new())
     }
 
-    fn make_impl_items(self: Box<DummyResult>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_impl_items(self: Box<DummyResult>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         Some(SmallVec::new())
     }
 
-    fn make_trait_impl_items(self: Box<DummyResult>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_impl_items(self: Box<DummyResult>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         Some(SmallVec::new())
     }
 
-    fn make_trait_items(self: Box<DummyResult>) -> Option<SmallVec<[P<ast::AssocItem>; 1]>> {
+    fn make_trait_items(self: Box<DummyResult>) -> Option<SmallVec<[Box<ast::AssocItem>; 1]>> {
         Some(SmallVec::new())
     }
 
-    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[P<ast::ForeignItem>; 1]>> {
+    fn make_foreign_items(self: Box<Self>) -> Option<SmallVec<[Box<ast::ForeignItem>; 1]>> {
         Some(SmallVec::new())
     }
 
@@ -665,11 +664,11 @@ impl MacResult for DummyResult {
         }])
     }
 
-    fn make_ty(self: Box<DummyResult>) -> Option<P<ast::Ty>> {
+    fn make_ty(self: Box<DummyResult>) -> Option<Box<ast::Ty>> {
         // FIXME(nnethercote): you might expect `ast::TyKind::Dummy` to be used here, but some
         // values produced here end up being lowered to HIR, which `ast::TyKind::Dummy` does not
         // support, so we use an empty tuple instead.
-        Some(P(ast::Ty {
+        Some(Box::new(ast::Ty {
             id: ast::DUMMY_NODE_ID,
             kind: ast::TyKind::Tup(ThinVec::new()),
             span: self.span,
@@ -1162,7 +1161,7 @@ pub trait LintStoreExpand {
         registered_tools: &RegisteredTools,
         node_id: NodeId,
         attrs: &[Attribute],
-        items: &[P<Item>],
+        items: &[Box<Item>],
         name: Symbol,
     );
 }
diff --git a/compiler/rustc_expand/src/build.rs b/compiler/rustc_expand/src/build.rs
index 51d6e43ab67..c3e86ec0614 100644
--- a/compiler/rustc_expand/src/build.rs
+++ b/compiler/rustc_expand/src/build.rs
@@ -1,4 +1,3 @@
-use rustc_ast::ptr::P;
 use rustc_ast::token::Delimiter;
 use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::util::literal;
@@ -59,10 +58,10 @@ impl<'a> ExtCtxt<'a> {
         path: ast::Path,
         delim: Delimiter,
         tokens: TokenStream,
-    ) -> P<ast::MacCall> {
-        P(ast::MacCall {
+    ) -> Box<ast::MacCall> {
+        Box::new(ast::MacCall {
             path,
-            args: P(ast::DelimArgs {
+            args: Box::new(ast::DelimArgs {
                 dspan: tokenstream::DelimSpan { open: span, close: span },
                 delim,
                 tokens,
@@ -70,32 +69,32 @@ impl<'a> ExtCtxt<'a> {
         })
     }
 
-    pub fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
+    pub fn ty_mt(&self, ty: Box<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
         ast::MutTy { ty, mutbl }
     }
 
-    pub fn ty(&self, span: Span, kind: ast::TyKind) -> P<ast::Ty> {
-        P(ast::Ty { id: ast::DUMMY_NODE_ID, span, kind, tokens: None })
+    pub fn ty(&self, span: Span, kind: ast::TyKind) -> Box<ast::Ty> {
+        Box::new(ast::Ty { id: ast::DUMMY_NODE_ID, span, kind, tokens: None })
     }
 
-    pub fn ty_infer(&self, span: Span) -> P<ast::Ty> {
+    pub fn ty_infer(&self, span: Span) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Infer)
     }
 
-    pub fn ty_path(&self, path: ast::Path) -> P<ast::Ty> {
+    pub fn ty_path(&self, path: ast::Path) -> Box<ast::Ty> {
         self.ty(path.span, ast::TyKind::Path(None, path))
     }
 
     // Might need to take bounds as an argument in the future, if you ever want
     // to generate a bounded existential trait type.
-    pub fn ty_ident(&self, span: Span, ident: Ident) -> P<ast::Ty> {
+    pub fn ty_ident(&self, span: Span, ident: Ident) -> Box<ast::Ty> {
         self.ty_path(self.path_ident(span, ident))
     }
 
     pub fn anon_const(&self, span: Span, kind: ast::ExprKind) -> ast::AnonConst {
         ast::AnonConst {
             id: ast::DUMMY_NODE_ID,
-            value: P(ast::Expr {
+            value: Box::new(ast::Expr {
                 id: ast::DUMMY_NODE_ID,
                 kind,
                 span,
@@ -112,14 +111,14 @@ impl<'a> ExtCtxt<'a> {
     pub fn ty_ref(
         &self,
         span: Span,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         lifetime: Option<ast::Lifetime>,
         mutbl: ast::Mutability,
-    ) -> P<ast::Ty> {
+    ) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Ref(lifetime, self.ty_mt(ty, mutbl)))
     }
 
-    pub fn ty_ptr(&self, span: Span, ty: P<ast::Ty>, mutbl: ast::Mutability) -> P<ast::Ty> {
+    pub fn ty_ptr(&self, span: Span, ty: Box<ast::Ty>, mutbl: ast::Mutability) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Ptr(self.ty_mt(ty, mutbl)))
     }
 
@@ -128,7 +127,7 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         bounds: ast::GenericBounds,
-        default: Option<P<ast::Ty>>,
+        default: Option<Box<ast::Ty>>,
     ) -> ast::GenericParam {
         ast::GenericParam {
             ident: ident.with_span_pos(span),
@@ -163,7 +162,7 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         bounds: ast::GenericBounds,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         default: Option<AnonConst>,
     ) -> ast::GenericParam {
         ast::GenericParam {
@@ -211,11 +210,11 @@ impl<'a> ExtCtxt<'a> {
         self.lifetime(span, Ident::new(kw::StaticLifetime, span))
     }
 
-    pub fn stmt_expr(&self, expr: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_expr(&self, expr: Box<ast::Expr>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, span: expr.span, kind: ast::StmtKind::Expr(expr) }
     }
 
-    pub fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: Box<ast::Expr>) -> ast::Stmt {
         self.stmt_let_ty(sp, mutbl, ident, None, ex)
     }
 
@@ -224,15 +223,15 @@ impl<'a> ExtCtxt<'a> {
         sp: Span,
         mutbl: bool,
         ident: Ident,
-        ty: Option<P<ast::Ty>>,
-        ex: P<ast::Expr>,
+        ty: Option<Box<ast::Ty>>,
+        ex: Box<ast::Expr>,
     ) -> ast::Stmt {
         let pat = if mutbl {
             self.pat_ident_binding_mode(sp, ident, ast::BindingMode::MUT)
         } else {
             self.pat_ident(sp, ident)
         };
-        let local = P(ast::Local {
+        let local = Box::new(ast::Local {
             super_: None,
             pat,
             ty,
@@ -247,8 +246,8 @@ impl<'a> ExtCtxt<'a> {
     }
 
     /// Generates `let _: Type;`, which is usually used for type assertions.
-    pub fn stmt_let_type_only(&self, span: Span, ty: P<ast::Ty>) -> ast::Stmt {
-        let local = P(ast::Local {
+    pub fn stmt_let_type_only(&self, span: Span, ty: Box<ast::Ty>) -> ast::Stmt {
+        let local = Box::new(ast::Local {
             super_: None,
             pat: self.pat_wild(span),
             ty: Some(ty),
@@ -262,19 +261,19 @@ impl<'a> ExtCtxt<'a> {
         self.stmt_local(local, span)
     }
 
-    pub fn stmt_semi(&self, expr: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_semi(&self, expr: Box<ast::Expr>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, span: expr.span, kind: ast::StmtKind::Semi(expr) }
     }
 
-    pub fn stmt_local(&self, local: P<ast::Local>, span: Span) -> ast::Stmt {
+    pub fn stmt_local(&self, local: Box<ast::Local>, span: Span) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Let(local), span }
     }
 
-    pub fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> ast::Stmt {
+    pub fn stmt_item(&self, sp: Span, item: Box<ast::Item>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Item(item), span: sp }
     }
 
-    pub fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block> {
+    pub fn block_expr(&self, expr: Box<ast::Expr>) -> Box<ast::Block> {
         self.block(
             expr.span,
             thin_vec![ast::Stmt {
@@ -284,8 +283,8 @@ impl<'a> ExtCtxt<'a> {
             }],
         )
     }
-    pub fn block(&self, span: Span, stmts: ThinVec<ast::Stmt>) -> P<ast::Block> {
-        P(ast::Block {
+    pub fn block(&self, span: Span, stmts: ThinVec<ast::Stmt>) -> Box<ast::Block> {
+        Box::new(ast::Block {
             stmts,
             id: ast::DUMMY_NODE_ID,
             rules: BlockCheckMode::Default,
@@ -294,22 +293,28 @@ impl<'a> ExtCtxt<'a> {
         })
     }
 
-    pub fn expr(&self, span: Span, kind: ast::ExprKind) -> P<ast::Expr> {
-        P(ast::Expr { id: ast::DUMMY_NODE_ID, kind, span, attrs: AttrVec::new(), tokens: None })
+    pub fn expr(&self, span: Span, kind: ast::ExprKind) -> Box<ast::Expr> {
+        Box::new(ast::Expr {
+            id: ast::DUMMY_NODE_ID,
+            kind,
+            span,
+            attrs: AttrVec::new(),
+            tokens: None,
+        })
     }
 
-    pub fn expr_path(&self, path: ast::Path) -> P<ast::Expr> {
+    pub fn expr_path(&self, path: ast::Path) -> Box<ast::Expr> {
         self.expr(path.span, ast::ExprKind::Path(None, path))
     }
 
-    pub fn expr_ident(&self, span: Span, id: Ident) -> P<ast::Expr> {
+    pub fn expr_ident(&self, span: Span, id: Ident) -> Box<ast::Expr> {
         self.expr_path(self.path_ident(span, id))
     }
-    pub fn expr_self(&self, span: Span) -> P<ast::Expr> {
+    pub fn expr_self(&self, span: Span) -> Box<ast::Expr> {
         self.expr_ident(span, Ident::with_dummy_span(kw::SelfLower))
     }
 
-    pub fn expr_macro_call(&self, span: Span, call: P<ast::MacCall>) -> P<ast::Expr> {
+    pub fn expr_macro_call(&self, span: Span, call: Box<ast::MacCall>) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::MacCall(call))
     }
 
@@ -317,31 +322,31 @@ impl<'a> ExtCtxt<'a> {
         &self,
         sp: Span,
         op: ast::BinOpKind,
-        lhs: P<ast::Expr>,
-        rhs: P<ast::Expr>,
-    ) -> P<ast::Expr> {
+        lhs: Box<ast::Expr>,
+        rhs: Box<ast::Expr>,
+    ) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Binary(Spanned { node: op, span: sp }, lhs, rhs))
     }
 
-    pub fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_deref(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Unary(UnOp::Deref, e))
     }
 
-    pub fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_addr_of(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::AddrOf(ast::BorrowKind::Ref, ast::Mutability::Not, e))
     }
 
-    pub fn expr_paren(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_paren(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Paren(e))
     }
 
     pub fn expr_method_call(
         &self,
         span: Span,
-        expr: P<ast::Expr>,
+        expr: Box<ast::Expr>,
         ident: Ident,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let seg = ast::PathSegment::from_ident(ident);
         self.expr(
             span,
@@ -357,38 +362,38 @@ impl<'a> ExtCtxt<'a> {
     pub fn expr_call(
         &self,
         span: Span,
-        expr: P<ast::Expr>,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        expr: Box<ast::Expr>,
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::Call(expr, args))
     }
-    pub fn expr_loop(&self, sp: Span, block: P<ast::Block>) -> P<ast::Expr> {
+    pub fn expr_loop(&self, sp: Span, block: Box<ast::Block>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Loop(block, None, sp))
     }
-    pub fn expr_asm(&self, sp: Span, expr: P<ast::InlineAsm>) -> P<ast::Expr> {
+    pub fn expr_asm(&self, sp: Span, expr: Box<ast::InlineAsm>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::InlineAsm(expr))
     }
     pub fn expr_call_ident(
         &self,
         span: Span,
         id: Ident,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::Call(self.expr_ident(span, id), args))
     }
     pub fn expr_call_global(
         &self,
         sp: Span,
         fn_path: Vec<Ident>,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let pathexpr = self.expr_path(self.path_global(sp, fn_path));
         self.expr_call(sp, pathexpr, args)
     }
-    pub fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {
+    pub fn expr_block(&self, b: Box<ast::Block>) -> Box<ast::Expr> {
         self.expr(b.span, ast::ExprKind::Block(b, None))
     }
-    pub fn field_imm(&self, span: Span, ident: Ident, e: P<ast::Expr>) -> ast::ExprField {
+    pub fn field_imm(&self, span: Span, ident: Ident, e: Box<ast::Expr>) -> ast::ExprField {
         ast::ExprField {
             ident: ident.with_span_pos(span),
             expr: e,
@@ -404,10 +409,10 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         path: ast::Path,
         fields: ThinVec<ast::ExprField>,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.expr(
             span,
-            ast::ExprKind::Struct(P(ast::StructExpr {
+            ast::ExprKind::Struct(Box::new(ast::StructExpr {
                 qself: None,
                 path,
                 fields,
@@ -420,61 +425,61 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         id: Ident,
         fields: ThinVec<ast::ExprField>,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.expr_struct(span, self.path_ident(span, id), fields)
     }
 
-    pub fn expr_usize(&self, span: Span, n: usize) -> P<ast::Expr> {
+    pub fn expr_usize(&self, span: Span, n: usize) -> Box<ast::Expr> {
         let suffix = Some(ast::UintTy::Usize.name());
         let lit = token::Lit::new(token::Integer, sym::integer(n), suffix);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_u32(&self, span: Span, n: u32) -> P<ast::Expr> {
+    pub fn expr_u32(&self, span: Span, n: u32) -> Box<ast::Expr> {
         let suffix = Some(ast::UintTy::U32.name());
         let lit = token::Lit::new(token::Integer, sym::integer(n), suffix);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_bool(&self, span: Span, value: bool) -> P<ast::Expr> {
+    pub fn expr_bool(&self, span: Span, value: bool) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::Bool, if value { kw::True } else { kw::False }, None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_str(&self, span: Span, s: Symbol) -> P<ast::Expr> {
+    pub fn expr_str(&self, span: Span, s: Symbol) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::Str, literal::escape_string_symbol(s), None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_byte_str(&self, span: Span, bytes: Vec<u8>) -> P<ast::Expr> {
+    pub fn expr_byte_str(&self, span: Span, bytes: Vec<u8>) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::ByteStr, literal::escape_byte_str_symbol(&bytes), None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
     /// `[expr1, expr2, ...]`
-    pub fn expr_array(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_array(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Array(exprs))
     }
 
     /// `&[expr1, expr2, ...]`
-    pub fn expr_array_ref(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_array_ref(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr_addr_of(sp, self.expr_array(sp, exprs))
     }
 
-    pub fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_some(&self, sp: Span, expr: Box<ast::Expr>) -> Box<ast::Expr> {
         let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
         self.expr_call_global(sp, some, thin_vec![expr])
     }
 
-    pub fn expr_none(&self, sp: Span) -> P<ast::Expr> {
+    pub fn expr_none(&self, sp: Span) -> Box<ast::Expr> {
         let none = self.std_path(&[sym::option, sym::Option, sym::None]);
         self.expr_path(self.path_global(sp, none))
     }
-    pub fn expr_tuple(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_tuple(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Tup(exprs))
     }
 
-    pub fn expr_unreachable(&self, span: Span) -> P<ast::Expr> {
+    pub fn expr_unreachable(&self, span: Span) -> Box<ast::Expr> {
         self.expr_macro_call(
             span,
             self.macro_call(
@@ -489,12 +494,12 @@ impl<'a> ExtCtxt<'a> {
         )
     }
 
-    pub fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_ok(&self, sp: Span, expr: Box<ast::Expr>) -> Box<ast::Expr> {
         let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
         self.expr_call_global(sp, ok, thin_vec![expr])
     }
 
-    pub fn expr_try(&self, sp: Span, head: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_try(&self, sp: Span, head: Box<ast::Expr>) -> Box<ast::Expr> {
         let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
         let ok_path = self.path_global(sp, ok);
         let err = self.std_path(&[sym::result, sym::Result, sym::Err]);
@@ -523,16 +528,16 @@ impl<'a> ExtCtxt<'a> {
         self.expr_match(sp, head, thin_vec![ok_arm, err_arm])
     }
 
-    pub fn pat(&self, span: Span, kind: PatKind) -> P<ast::Pat> {
-        P(ast::Pat { id: ast::DUMMY_NODE_ID, kind, span, tokens: None })
+    pub fn pat(&self, span: Span, kind: PatKind) -> Box<ast::Pat> {
+        Box::new(ast::Pat { id: ast::DUMMY_NODE_ID, kind, span, tokens: None })
     }
-    pub fn pat_wild(&self, span: Span) -> P<ast::Pat> {
+    pub fn pat_wild(&self, span: Span) -> Box<ast::Pat> {
         self.pat(span, PatKind::Wild)
     }
-    pub fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
+    pub fn pat_lit(&self, span: Span, expr: Box<ast::Expr>) -> Box<ast::Pat> {
         self.pat(span, PatKind::Expr(expr))
     }
-    pub fn pat_ident(&self, span: Span, ident: Ident) -> P<ast::Pat> {
+    pub fn pat_ident(&self, span: Span, ident: Ident) -> Box<ast::Pat> {
         self.pat_ident_binding_mode(span, ident, ast::BindingMode::NONE)
     }
 
@@ -541,19 +546,19 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         ann: ast::BindingMode,
-    ) -> P<ast::Pat> {
+    ) -> Box<ast::Pat> {
         let pat = PatKind::Ident(ann, ident.with_span_pos(span), None);
         self.pat(span, pat)
     }
-    pub fn pat_path(&self, span: Span, path: ast::Path) -> P<ast::Pat> {
+    pub fn pat_path(&self, span: Span, path: ast::Path) -> Box<ast::Pat> {
         self.pat(span, PatKind::Path(None, path))
     }
     pub fn pat_tuple_struct(
         &self,
         span: Span,
         path: ast::Path,
-        subpats: ThinVec<P<ast::Pat>>,
-    ) -> P<ast::Pat> {
+        subpats: ThinVec<Box<ast::Pat>>,
+    ) -> Box<ast::Pat> {
         self.pat(span, PatKind::TupleStruct(None, path, subpats))
     }
     pub fn pat_struct(
@@ -561,20 +566,20 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         path: ast::Path,
         field_pats: ThinVec<ast::PatField>,
-    ) -> P<ast::Pat> {
+    ) -> Box<ast::Pat> {
         self.pat(span, PatKind::Struct(None, path, field_pats, ast::PatFieldsRest::None))
     }
-    pub fn pat_tuple(&self, span: Span, pats: ThinVec<P<ast::Pat>>) -> P<ast::Pat> {
+    pub fn pat_tuple(&self, span: Span, pats: ThinVec<Box<ast::Pat>>) -> Box<ast::Pat> {
         self.pat(span, PatKind::Tuple(pats))
     }
 
-    pub fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
+    pub fn pat_some(&self, span: Span, pat: Box<ast::Pat>) -> Box<ast::Pat> {
         let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
         let path = self.path_global(span, some);
         self.pat_tuple_struct(span, path, thin_vec![pat])
     }
 
-    pub fn arm(&self, span: Span, pat: P<ast::Pat>, expr: P<ast::Expr>) -> ast::Arm {
+    pub fn arm(&self, span: Span, pat: Box<ast::Pat>, expr: Box<ast::Expr>) -> ast::Arm {
         ast::Arm {
             attrs: AttrVec::new(),
             pat,
@@ -590,22 +595,27 @@ impl<'a> ExtCtxt<'a> {
         self.arm(span, self.pat_wild(span), self.expr_unreachable(span))
     }
 
-    pub fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: ThinVec<ast::Arm>) -> P<Expr> {
+    pub fn expr_match(
+        &self,
+        span: Span,
+        arg: Box<ast::Expr>,
+        arms: ThinVec<ast::Arm>,
+    ) -> Box<Expr> {
         self.expr(span, ast::ExprKind::Match(arg, arms, MatchKind::Prefix))
     }
 
     pub fn expr_if(
         &self,
         span: Span,
-        cond: P<ast::Expr>,
-        then: P<ast::Expr>,
-        els: Option<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        cond: Box<ast::Expr>,
+        then: Box<ast::Expr>,
+        els: Option<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let els = els.map(|x| self.expr_block(self.block_expr(x)));
         self.expr(span, ast::ExprKind::If(cond, self.block_expr(then), els))
     }
 
-    pub fn lambda(&self, span: Span, ids: Vec<Ident>, body: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn lambda(&self, span: Span, ids: Vec<Ident>, body: Box<ast::Expr>) -> Box<ast::Expr> {
         let fn_decl = self.fn_decl(
             ids.iter().map(|id| self.param(span, *id, self.ty(span, ast::TyKind::Infer))).collect(),
             ast::FnRetTy::Default(span),
@@ -633,11 +643,11 @@ impl<'a> ExtCtxt<'a> {
         )
     }
 
-    pub fn lambda0(&self, span: Span, body: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn lambda0(&self, span: Span, body: Box<ast::Expr>) -> Box<ast::Expr> {
         self.lambda(span, Vec::new(), body)
     }
 
-    pub fn lambda1(&self, span: Span, body: P<ast::Expr>, ident: Ident) -> P<ast::Expr> {
+    pub fn lambda1(&self, span: Span, body: Box<ast::Expr>, ident: Ident) -> Box<ast::Expr> {
         self.lambda(span, vec![ident], body)
     }
 
@@ -646,11 +656,11 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         stmts: ThinVec<ast::Stmt>,
         ident: Ident,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.lambda1(span, self.expr_block(self.block(span, stmts)), ident)
     }
 
-    pub fn param(&self, span: Span, ident: Ident, ty: P<ast::Ty>) -> ast::Param {
+    pub fn param(&self, span: Span, ident: Ident, ty: Box<ast::Ty>) -> ast::Param {
         let arg_pat = self.pat_ident(span, ident);
         ast::Param {
             attrs: AttrVec::default(),
@@ -663,12 +673,12 @@ impl<'a> ExtCtxt<'a> {
     }
 
     // `self` is unused but keep it as method for the convenience use.
-    pub fn fn_decl(&self, inputs: ThinVec<ast::Param>, output: ast::FnRetTy) -> P<ast::FnDecl> {
-        P(ast::FnDecl { inputs, output })
+    pub fn fn_decl(&self, inputs: ThinVec<ast::Param>, output: ast::FnRetTy) -> Box<ast::FnDecl> {
+        Box::new(ast::FnDecl { inputs, output })
     }
 
-    pub fn item(&self, span: Span, attrs: ast::AttrVec, kind: ast::ItemKind) -> P<ast::Item> {
-        P(ast::Item {
+    pub fn item(&self, span: Span, attrs: ast::AttrVec, kind: ast::ItemKind) -> Box<ast::Item> {
+        Box::new(ast::Item {
             attrs,
             id: ast::DUMMY_NODE_ID,
             kind,
@@ -686,10 +696,10 @@ impl<'a> ExtCtxt<'a> {
         &self,
         span: Span,
         ident: Ident,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         mutability: ast::Mutability,
-        expr: P<ast::Expr>,
-    ) -> P<ast::Item> {
+        expr: Box<ast::Expr>,
+    ) -> Box<ast::Item> {
         self.item(
             span,
             AttrVec::new(),
@@ -711,9 +721,9 @@ impl<'a> ExtCtxt<'a> {
         &self,
         span: Span,
         ident: Ident,
-        ty: P<ast::Ty>,
-        expr: P<ast::Expr>,
-    ) -> P<ast::Item> {
+        ty: Box<ast::Ty>,
+        expr: Box<ast::Expr>,
+    ) -> Box<ast::Item> {
         let defaultness = ast::Defaultness::Final;
         self.item(
             span,
diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs
index f02aa6c120f..e7ae4416968 100644
--- a/compiler/rustc_expand/src/expand.rs
+++ b/compiler/rustc_expand/src/expand.rs
@@ -4,7 +4,6 @@ use std::sync::Arc;
 use std::{iter, mem};
 
 use rustc_ast::mut_visit::*;
-use rustc_ast::ptr::P;
 use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::visit::{self, AssocCtxt, Visitor, VisitorResult, try_visit, walk_list};
 use rustc_ast::{
@@ -65,8 +64,8 @@ macro_rules! ast_fragments {
         /// A fragment of AST that can be produced by a single macro expansion.
         /// Can also serve as an input and intermediate result for macro expansion operations.
         pub enum AstFragment {
-            OptExpr(Option<P<ast::Expr>>),
-            MethodReceiverExpr(P<ast::Expr>),
+            OptExpr(Option<Box<ast::Expr>>),
+            MethodReceiverExpr(Box<ast::Expr>),
             $($Kind($AstTy),)*
         }
 
@@ -112,14 +111,14 @@ macro_rules! ast_fragments {
                 }
             }
 
-            pub(crate) fn make_opt_expr(self) -> Option<P<ast::Expr>> {
+            pub(crate) fn make_opt_expr(self) -> Option<Box<ast::Expr>> {
                 match self {
                     AstFragment::OptExpr(expr) => expr,
                     _ => panic!("AstFragment::make_* called on the wrong kind of fragment"),
                 }
             }
 
-            pub(crate) fn make_method_receiver_expr(self) -> P<ast::Expr> {
+            pub(crate) fn make_method_receiver_expr(self) -> Box<ast::Expr> {
                 match self {
                     AstFragment::MethodReceiverExpr(expr) => expr,
                     _ => panic!("AstFragment::make_* called on the wrong kind of fragment"),
@@ -188,17 +187,17 @@ macro_rules! ast_fragments {
 }
 
 ast_fragments! {
-    Expr(P<ast::Expr>) {
+    Expr(Box<ast::Expr>) {
         "expression";
         one fn visit_expr; fn visit_expr; fn pprust::expr_to_string;
         fn make_expr;
     }
-    Pat(P<ast::Pat>) {
+    Pat(Box<ast::Pat>) {
         "pattern";
         one fn visit_pat; fn visit_pat; fn pprust::pat_to_string;
         fn make_pat;
     }
-    Ty(P<ast::Ty>) {
+    Ty(Box<ast::Ty>) {
         "type";
         one fn visit_ty; fn visit_ty; fn pprust::ty_to_string;
         fn make_ty;
@@ -208,30 +207,30 @@ ast_fragments! {
         many fn flat_map_stmt; fn visit_stmt(); fn pprust::stmt_to_string;
         fn make_stmts;
     }
-    Items(SmallVec<[P<ast::Item>; 1]>) {
+    Items(SmallVec<[Box<ast::Item>; 1]>) {
         "item";
         many fn flat_map_item; fn visit_item(); fn pprust::item_to_string;
         fn make_items;
     }
-    TraitItems(SmallVec<[P<ast::AssocItem>; 1]>) {
+    TraitItems(SmallVec<[Box<ast::AssocItem>; 1]>) {
         "trait item";
         many fn flat_map_assoc_item; fn visit_assoc_item(AssocCtxt::Trait);
             fn pprust::assoc_item_to_string;
         fn make_trait_items;
     }
-    ImplItems(SmallVec<[P<ast::AssocItem>; 1]>) {
+    ImplItems(SmallVec<[Box<ast::AssocItem>; 1]>) {
         "impl item";
         many fn flat_map_assoc_item; fn visit_assoc_item(AssocCtxt::Impl { of_trait: false });
             fn pprust::assoc_item_to_string;
         fn make_impl_items;
     }
-    TraitImplItems(SmallVec<[P<ast::AssocItem>; 1]>) {
+    TraitImplItems(SmallVec<[Box<ast::AssocItem>; 1]>) {
         "impl item";
         many fn flat_map_assoc_item; fn visit_assoc_item(AssocCtxt::Impl { of_trait: true });
             fn pprust::assoc_item_to_string;
         fn make_trait_impl_items;
     }
-    ForeignItems(SmallVec<[P<ast::ForeignItem>; 1]>) {
+    ForeignItems(SmallVec<[Box<ast::ForeignItem>; 1]>) {
         "foreign item";
         many fn flat_map_foreign_item; fn visit_foreign_item(); fn pprust::foreign_item_to_string;
         fn make_foreign_items;
@@ -392,7 +391,7 @@ pub struct Invocation {
 
 pub enum InvocationKind {
     Bang {
-        mac: P<ast::MacCall>,
+        mac: Box<ast::MacCall>,
         span: Span,
     },
     Attr {
@@ -409,7 +408,7 @@ pub enum InvocationKind {
         item: Annotatable,
     },
     GlobDelegation {
-        item: P<ast::AssocItem>,
+        item: Box<ast::AssocItem>,
         /// Whether this is a trait impl or an inherent impl
         of_trait: bool,
     },
@@ -948,15 +947,14 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                     _ => unreachable!(),
                 };
 
-                type Node = AstNodeWrapper<P<ast::AssocItem>, ImplItemTag>;
+                type Node = AstNodeWrapper<Box<ast::AssocItem>, ImplItemTag>;
                 let single_delegations = build_single_delegations::<Node>(
                     self.cx, deleg, &item, &suffixes, item.span, true,
                 );
                 // `-Zmacro-stats` ignores these because they don't seem important.
-                fragment_kind.expect_from_annotatables(
-                    single_delegations
-                        .map(|item| Annotatable::AssocItem(P(item), AssocCtxt::Impl { of_trait })),
-                )
+                fragment_kind.expect_from_annotatables(single_delegations.map(|item| {
+                    Annotatable::AssocItem(Box::new(item), AssocCtxt::Impl { of_trait })
+                }))
             }
         })
     }
@@ -1228,7 +1226,7 @@ trait InvocationCollectorNode: HasAttrs + HasNodeId + Sized {
     fn is_mac_call(&self) -> bool {
         false
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         unreachable!()
     }
     fn delegation(&self) -> Option<(&ast::DelegationMac, &ast::Item<Self::ItemKind>)> {
@@ -1269,7 +1267,7 @@ trait InvocationCollectorNode: HasAttrs + HasNodeId + Sized {
     }
 }
 
-impl InvocationCollectorNode for P<ast::Item> {
+impl InvocationCollectorNode for Box<ast::Item> {
     const KIND: AstFragmentKind = AstFragmentKind::Items;
     fn to_annotatable(self) -> Annotatable {
         Annotatable::Item(self)
@@ -1283,7 +1281,7 @@ impl InvocationCollectorNode for P<ast::Item> {
     fn is_mac_call(&self) -> bool {
         matches!(self.kind, ItemKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         match self.kind {
             ItemKind::MacCall(mac) => (mac, self.attrs, AddSemicolon::No),
             _ => unreachable!(),
@@ -1299,7 +1297,7 @@ impl InvocationCollectorNode for P<ast::Item> {
         ItemKind::Delegation(deleg)
     }
     fn from_item(item: ast::Item<Self::ItemKind>) -> Self {
-        P(item)
+        Box::new(item)
     }
     fn flatten_outputs(items: impl Iterator<Item = Self::OutputTy>) -> Self::OutputTy {
         items.flatten().collect()
@@ -1421,8 +1419,8 @@ impl InvocationCollectorNode for P<ast::Item> {
 }
 
 struct TraitItemTag;
-impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitItemTag> {
-    type OutputTy = SmallVec<[P<ast::AssocItem>; 1]>;
+impl InvocationCollectorNode for AstNodeWrapper<Box<ast::AssocItem>, TraitItemTag> {
+    type OutputTy = SmallVec<[Box<ast::AssocItem>; 1]>;
     type ItemKind = AssocItemKind;
     const KIND: AstFragmentKind = AstFragmentKind::TraitItems;
     fn to_annotatable(self) -> Annotatable {
@@ -1437,7 +1435,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitItemTag>
     fn is_mac_call(&self) -> bool {
         matches!(self.wrapped.kind, AssocItemKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         let item = self.wrapped;
         match item.kind {
             AssocItemKind::MacCall(mac) => (mac, item.attrs, AddSemicolon::No),
@@ -1454,7 +1452,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitItemTag>
         AssocItemKind::Delegation(deleg)
     }
     fn from_item(item: ast::Item<Self::ItemKind>) -> Self {
-        AstNodeWrapper::new(P(item), TraitItemTag)
+        AstNodeWrapper::new(Box::new(item), TraitItemTag)
     }
     fn flatten_outputs(items: impl Iterator<Item = Self::OutputTy>) -> Self::OutputTy {
         items.flatten().collect()
@@ -1462,8 +1460,8 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitItemTag>
 }
 
 struct ImplItemTag;
-impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, ImplItemTag> {
-    type OutputTy = SmallVec<[P<ast::AssocItem>; 1]>;
+impl InvocationCollectorNode for AstNodeWrapper<Box<ast::AssocItem>, ImplItemTag> {
+    type OutputTy = SmallVec<[Box<ast::AssocItem>; 1]>;
     type ItemKind = AssocItemKind;
     const KIND: AstFragmentKind = AstFragmentKind::ImplItems;
     fn to_annotatable(self) -> Annotatable {
@@ -1478,7 +1476,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, ImplItemTag>
     fn is_mac_call(&self) -> bool {
         matches!(self.wrapped.kind, AssocItemKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         let item = self.wrapped;
         match item.kind {
             AssocItemKind::MacCall(mac) => (mac, item.attrs, AddSemicolon::No),
@@ -1495,7 +1493,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, ImplItemTag>
         AssocItemKind::Delegation(deleg)
     }
     fn from_item(item: ast::Item<Self::ItemKind>) -> Self {
-        AstNodeWrapper::new(P(item), ImplItemTag)
+        AstNodeWrapper::new(Box::new(item), ImplItemTag)
     }
     fn flatten_outputs(items: impl Iterator<Item = Self::OutputTy>) -> Self::OutputTy {
         items.flatten().collect()
@@ -1503,8 +1501,8 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, ImplItemTag>
 }
 
 struct TraitImplItemTag;
-impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitImplItemTag> {
-    type OutputTy = SmallVec<[P<ast::AssocItem>; 1]>;
+impl InvocationCollectorNode for AstNodeWrapper<Box<ast::AssocItem>, TraitImplItemTag> {
+    type OutputTy = SmallVec<[Box<ast::AssocItem>; 1]>;
     type ItemKind = AssocItemKind;
     const KIND: AstFragmentKind = AstFragmentKind::TraitImplItems;
     fn to_annotatable(self) -> Annotatable {
@@ -1519,7 +1517,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitImplItem
     fn is_mac_call(&self) -> bool {
         matches!(self.wrapped.kind, AssocItemKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         let item = self.wrapped;
         match item.kind {
             AssocItemKind::MacCall(mac) => (mac, item.attrs, AddSemicolon::No),
@@ -1536,14 +1534,14 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::AssocItem>, TraitImplItem
         AssocItemKind::Delegation(deleg)
     }
     fn from_item(item: ast::Item<Self::ItemKind>) -> Self {
-        AstNodeWrapper::new(P(item), TraitImplItemTag)
+        AstNodeWrapper::new(Box::new(item), TraitImplItemTag)
     }
     fn flatten_outputs(items: impl Iterator<Item = Self::OutputTy>) -> Self::OutputTy {
         items.flatten().collect()
     }
 }
 
-impl InvocationCollectorNode for P<ast::ForeignItem> {
+impl InvocationCollectorNode for Box<ast::ForeignItem> {
     const KIND: AstFragmentKind = AstFragmentKind::ForeignItems;
     fn to_annotatable(self) -> Annotatable {
         Annotatable::ForeignItem(self)
@@ -1557,7 +1555,7 @@ impl InvocationCollectorNode for P<ast::ForeignItem> {
     fn is_mac_call(&self) -> bool {
         matches!(self.kind, ForeignItemKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         match self.kind {
             ForeignItemKind::MacCall(mac) => (mac, self.attrs, AddSemicolon::No),
             _ => unreachable!(),
@@ -1672,7 +1670,7 @@ impl InvocationCollectorNode for ast::Arm {
 impl InvocationCollectorNode for ast::Stmt {
     const KIND: AstFragmentKind = AstFragmentKind::Stmts;
     fn to_annotatable(self) -> Annotatable {
-        Annotatable::Stmt(P(self))
+        Annotatable::Stmt(Box::new(self))
     }
     fn fragment_to_output(fragment: AstFragment) -> Self::OutputTy {
         fragment.make_stmts()
@@ -1689,7 +1687,7 @@ impl InvocationCollectorNode for ast::Stmt {
             StmtKind::Let(..) | StmtKind::Empty => false,
         }
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         // We pull macro invocations (both attributes and fn-like macro calls) out of their
         // `StmtKind`s and treat them as statement macro invocations, not as items or expressions.
         let (add_semicolon, mac, attrs) = match self.kind {
@@ -1726,7 +1724,7 @@ impl InvocationCollectorNode for ast::Stmt {
         ItemKind::Delegation(deleg)
     }
     fn from_item(item: ast::Item<Self::ItemKind>) -> Self {
-        ast::Stmt { id: ast::DUMMY_NODE_ID, span: item.span, kind: StmtKind::Item(P(item)) }
+        ast::Stmt { id: ast::DUMMY_NODE_ID, span: item.span, kind: StmtKind::Item(Box::new(item)) }
     }
     fn flatten_outputs(items: impl Iterator<Item = Self::OutputTy>) -> Self::OutputTy {
         items.flatten().collect()
@@ -1769,7 +1767,7 @@ impl InvocationCollectorNode for ast::Crate {
 }
 
 impl InvocationCollectorNode for ast::Ty {
-    type OutputTy = P<ast::Ty>;
+    type OutputTy = Box<ast::Ty>;
     const KIND: AstFragmentKind = AstFragmentKind::Ty;
     fn to_annotatable(self) -> Annotatable {
         unreachable!()
@@ -1793,7 +1791,7 @@ impl InvocationCollectorNode for ast::Ty {
     fn is_mac_call(&self) -> bool {
         matches!(self.kind, ast::TyKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         match self.kind {
             TyKind::MacCall(mac) => (mac, AttrVec::new(), AddSemicolon::No),
             _ => unreachable!(),
@@ -1802,7 +1800,7 @@ impl InvocationCollectorNode for ast::Ty {
 }
 
 impl InvocationCollectorNode for ast::Pat {
-    type OutputTy = P<ast::Pat>;
+    type OutputTy = Box<ast::Pat>;
     const KIND: AstFragmentKind = AstFragmentKind::Pat;
     fn to_annotatable(self) -> Annotatable {
         unreachable!()
@@ -1816,7 +1814,7 @@ impl InvocationCollectorNode for ast::Pat {
     fn is_mac_call(&self) -> bool {
         matches!(self.kind, PatKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         match self.kind {
             PatKind::MacCall(mac) => (mac, AttrVec::new(), AddSemicolon::No),
             _ => unreachable!(),
@@ -1825,10 +1823,10 @@ impl InvocationCollectorNode for ast::Pat {
 }
 
 impl InvocationCollectorNode for ast::Expr {
-    type OutputTy = P<ast::Expr>;
+    type OutputTy = Box<ast::Expr>;
     const KIND: AstFragmentKind = AstFragmentKind::Expr;
     fn to_annotatable(self) -> Annotatable {
-        Annotatable::Expr(P(self))
+        Annotatable::Expr(Box::new(self))
     }
     fn fragment_to_output(fragment: AstFragment) -> Self::OutputTy {
         fragment.make_expr()
@@ -1842,7 +1840,7 @@ impl InvocationCollectorNode for ast::Expr {
     fn is_mac_call(&self) -> bool {
         matches!(self.kind, ExprKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         match self.kind {
             ExprKind::MacCall(mac) => (mac, self.attrs, AddSemicolon::No),
             _ => unreachable!(),
@@ -1851,8 +1849,8 @@ impl InvocationCollectorNode for ast::Expr {
 }
 
 struct OptExprTag;
-impl InvocationCollectorNode for AstNodeWrapper<P<ast::Expr>, OptExprTag> {
-    type OutputTy = Option<P<ast::Expr>>;
+impl InvocationCollectorNode for AstNodeWrapper<Box<ast::Expr>, OptExprTag> {
+    type OutputTy = Option<Box<ast::Expr>>;
     const KIND: AstFragmentKind = AstFragmentKind::OptExpr;
     fn to_annotatable(self) -> Annotatable {
         Annotatable::Expr(self.wrapped)
@@ -1867,7 +1865,7 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::Expr>, OptExprTag> {
     fn is_mac_call(&self) -> bool {
         matches!(self.wrapped.kind, ast::ExprKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         let node = self.wrapped;
         match node.kind {
             ExprKind::MacCall(mac) => (mac, node.attrs, AddSemicolon::No),
@@ -1884,13 +1882,13 @@ impl InvocationCollectorNode for AstNodeWrapper<P<ast::Expr>, OptExprTag> {
 struct MethodReceiverTag;
 
 impl InvocationCollectorNode for AstNodeWrapper<ast::Expr, MethodReceiverTag> {
-    type OutputTy = AstNodeWrapper<P<ast::Expr>, MethodReceiverTag>;
+    type OutputTy = AstNodeWrapper<Box<ast::Expr>, MethodReceiverTag>;
     const KIND: AstFragmentKind = AstFragmentKind::MethodReceiverExpr;
     fn descr() -> &'static str {
         "an expression"
     }
     fn to_annotatable(self) -> Annotatable {
-        Annotatable::Expr(P(self.wrapped))
+        Annotatable::Expr(Box::new(self.wrapped))
     }
     fn fragment_to_output(fragment: AstFragment) -> Self::OutputTy {
         AstNodeWrapper::new(fragment.make_method_receiver_expr(), MethodReceiverTag)
@@ -1901,7 +1899,7 @@ impl InvocationCollectorNode for AstNodeWrapper<ast::Expr, MethodReceiverTag> {
     fn is_mac_call(&self) -> bool {
         matches!(self.wrapped.kind, ast::ExprKind::MacCall(..))
     }
-    fn take_mac_call(self) -> (P<ast::MacCall>, ast::AttrVec, AddSemicolon) {
+    fn take_mac_call(self) -> (Box<ast::MacCall>, ast::AttrVec, AddSemicolon) {
         let node = self.wrapped;
         match node.kind {
             ExprKind::MacCall(mac) => (mac, node.attrs, AddSemicolon::No),
@@ -2038,7 +2036,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
         placeholder(fragment_kind, NodeId::placeholder_from_expn_id(expn_id), vis)
     }
 
-    fn collect_bang(&mut self, mac: P<ast::MacCall>, kind: AstFragmentKind) -> AstFragment {
+    fn collect_bang(&mut self, mac: Box<ast::MacCall>, kind: AstFragmentKind) -> AstFragment {
         // cache the macro call span so that it can be
         // easily adjusted for incremental compilation
         let span = mac.span();
@@ -2056,7 +2054,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
 
     fn collect_glob_delegation(
         &mut self,
-        item: P<ast::AssocItem>,
+        item: Box<ast::AssocItem>,
         of_trait: bool,
         kind: AstFragmentKind,
     ) -> AstFragment {
@@ -2328,15 +2326,15 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
 }
 
 impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
-    fn flat_map_item(&mut self, node: P<ast::Item>) -> SmallVec<[P<ast::Item>; 1]> {
+    fn flat_map_item(&mut self, node: Box<ast::Item>) -> SmallVec<[Box<ast::Item>; 1]> {
         self.flat_map_node(node)
     }
 
     fn flat_map_assoc_item(
         &mut self,
-        node: P<ast::AssocItem>,
+        node: Box<ast::AssocItem>,
         ctxt: AssocCtxt,
-    ) -> SmallVec<[P<ast::AssocItem>; 1]> {
+    ) -> SmallVec<[Box<ast::AssocItem>; 1]> {
         match ctxt {
             AssocCtxt::Trait => self.flat_map_node(AstNodeWrapper::new(node, TraitItemTag)),
             AssocCtxt::Impl { of_trait: false } => {
@@ -2350,8 +2348,8 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
 
     fn flat_map_foreign_item(
         &mut self,
-        node: P<ast::ForeignItem>,
-    ) -> SmallVec<[P<ast::ForeignItem>; 1]> {
+        node: Box<ast::ForeignItem>,
+    ) -> SmallVec<[Box<ast::ForeignItem>; 1]> {
         self.flat_map_node(node)
     }
 
@@ -2446,7 +2444,7 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
         self.visit_node(AstNodeWrapper::from_mut(node, MethodReceiverTag))
     }
 
-    fn filter_map_expr(&mut self, node: P<ast::Expr>) -> Option<P<ast::Expr>> {
+    fn filter_map_expr(&mut self, node: Box<ast::Expr>) -> Option<Box<ast::Expr>> {
         self.flat_map_node(AstNodeWrapper::new(node, OptExprTag))
     }
 
diff --git a/compiler/rustc_expand/src/module.rs b/compiler/rustc_expand/src/module.rs
index e925052c607..662c67f2d3f 100644
--- a/compiler/rustc_expand/src/module.rs
+++ b/compiler/rustc_expand/src/module.rs
@@ -1,7 +1,6 @@
 use std::iter::once;
 use std::path::{self, Path, PathBuf};
 
-use rustc_ast::ptr::P;
 use rustc_ast::{AttrVec, Attribute, Inline, Item, ModSpans};
 use rustc_errors::{Diag, ErrorGuaranteed};
 use rustc_parse::{exp, new_parser_from_file, unwrap_or_emit_fatal, validate_attr};
@@ -31,7 +30,7 @@ pub struct ModulePathSuccess {
 }
 
 pub(crate) struct ParsedExternalMod {
-    pub items: ThinVec<P<Item>>,
+    pub items: ThinVec<Box<Item>>,
     pub spans: ModSpans,
     pub file_path: PathBuf,
     pub dir_path: PathBuf,
diff --git a/compiler/rustc_expand/src/placeholders.rs b/compiler/rustc_expand/src/placeholders.rs
index 6e1c6df4bcb..05f9a5aa43f 100644
--- a/compiler/rustc_expand/src/placeholders.rs
+++ b/compiler/rustc_expand/src/placeholders.rs
@@ -1,5 +1,4 @@
 use rustc_ast::mut_visit::*;
-use rustc_ast::ptr::P;
 use rustc_ast::token::Delimiter;
 use rustc_ast::visit::AssocCtxt;
 use rustc_ast::{self as ast, Safety};
@@ -15,10 +14,10 @@ pub(crate) fn placeholder(
     id: ast::NodeId,
     vis: Option<ast::Visibility>,
 ) -> AstFragment {
-    fn mac_placeholder() -> P<ast::MacCall> {
-        P(ast::MacCall {
+    fn mac_placeholder() -> Box<ast::MacCall> {
+        Box::new(ast::MacCall {
             path: ast::Path { span: DUMMY_SP, segments: ThinVec::new(), tokens: None },
-            args: P(ast::DelimArgs {
+            args: Box::new(ast::DelimArgs {
                 dspan: ast::tokenstream::DelimSpan::dummy(),
                 delim: Delimiter::Parenthesis,
                 tokens: ast::tokenstream::TokenStream::new(Vec::new()),
@@ -35,7 +34,7 @@ pub(crate) fn placeholder(
     });
     let span = DUMMY_SP;
     let expr_placeholder = || {
-        P(ast::Expr {
+        Box::new(ast::Expr {
             id,
             span,
             attrs: ast::AttrVec::new(),
@@ -43,10 +42,17 @@ pub(crate) fn placeholder(
             tokens: None,
         })
     };
-    let ty =
-        || P(ast::Ty { id, kind: ast::TyKind::MacCall(mac_placeholder()), span, tokens: None });
-    let pat =
-        || P(ast::Pat { id, kind: ast::PatKind::MacCall(mac_placeholder()), span, tokens: None });
+    let ty = || {
+        Box::new(ast::Ty { id, kind: ast::TyKind::MacCall(mac_placeholder()), span, tokens: None })
+    };
+    let pat = || {
+        Box::new(ast::Pat {
+            id,
+            kind: ast::PatKind::MacCall(mac_placeholder()),
+            span,
+            tokens: None,
+        })
+    };
 
     match kind {
         AstFragmentKind::Crate => AstFragment::Crate(ast::Crate {
@@ -59,7 +65,7 @@ pub(crate) fn placeholder(
         AstFragmentKind::Expr => AstFragment::Expr(expr_placeholder()),
         AstFragmentKind::OptExpr => AstFragment::OptExpr(Some(expr_placeholder())),
         AstFragmentKind::MethodReceiverExpr => AstFragment::MethodReceiverExpr(expr_placeholder()),
-        AstFragmentKind::Items => AstFragment::Items(smallvec![P(ast::Item {
+        AstFragmentKind::Items => AstFragment::Items(smallvec![Box::new(ast::Item {
             id,
             span,
             vis,
@@ -67,15 +73,17 @@ pub(crate) fn placeholder(
             kind: ast::ItemKind::MacCall(mac_placeholder()),
             tokens: None,
         })]),
-        AstFragmentKind::TraitItems => AstFragment::TraitItems(smallvec![P(ast::AssocItem {
-            id,
-            span,
-            vis,
-            attrs,
-            kind: ast::AssocItemKind::MacCall(mac_placeholder()),
-            tokens: None,
-        })]),
-        AstFragmentKind::ImplItems => AstFragment::ImplItems(smallvec![P(ast::AssocItem {
+        AstFragmentKind::TraitItems => {
+            AstFragment::TraitItems(smallvec![Box::new(ast::AssocItem {
+                id,
+                span,
+                vis,
+                attrs,
+                kind: ast::AssocItemKind::MacCall(mac_placeholder()),
+                tokens: None,
+            })])
+        }
+        AstFragmentKind::ImplItems => AstFragment::ImplItems(smallvec![Box::new(ast::AssocItem {
             id,
             span,
             vis,
@@ -84,7 +92,7 @@ pub(crate) fn placeholder(
             tokens: None,
         })]),
         AstFragmentKind::TraitImplItems => {
-            AstFragment::TraitImplItems(smallvec![P(ast::AssocItem {
+            AstFragment::TraitImplItems(smallvec![Box::new(ast::AssocItem {
                 id,
                 span,
                 vis,
@@ -94,7 +102,7 @@ pub(crate) fn placeholder(
             })])
         }
         AstFragmentKind::ForeignItems => {
-            AstFragment::ForeignItems(smallvec![P(ast::ForeignItem {
+            AstFragment::ForeignItems(smallvec![Box::new(ast::ForeignItem {
                 id,
                 span,
                 vis,
@@ -103,20 +111,20 @@ pub(crate) fn placeholder(
                 tokens: None,
             })])
         }
-        AstFragmentKind::Pat => AstFragment::Pat(P(ast::Pat {
+        AstFragmentKind::Pat => AstFragment::Pat(Box::new(ast::Pat {
             id,
             span,
             kind: ast::PatKind::MacCall(mac_placeholder()),
             tokens: None,
         })),
-        AstFragmentKind::Ty => AstFragment::Ty(P(ast::Ty {
+        AstFragmentKind::Ty => AstFragment::Ty(Box::new(ast::Ty {
             id,
             span,
             kind: ast::TyKind::MacCall(mac_placeholder()),
             tokens: None,
         })),
         AstFragmentKind::Stmts => AstFragment::Stmts(smallvec![{
-            let mac = P(ast::MacCallStmt {
+            let mac = Box::new(ast::MacCallStmt {
                 mac: mac_placeholder(),
                 style: ast::MacStmtStyle::Braces,
                 attrs: ast::AttrVec::new(),
@@ -297,7 +305,7 @@ impl MutVisitor for PlaceholderExpander {
         }
     }
 
-    fn flat_map_item(&mut self, item: P<ast::Item>) -> SmallVec<[P<ast::Item>; 1]> {
+    fn flat_map_item(&mut self, item: Box<ast::Item>) -> SmallVec<[Box<ast::Item>; 1]> {
         match item.kind {
             ast::ItemKind::MacCall(_) => self.remove(item.id).make_items(),
             _ => walk_flat_map_item(self, item),
@@ -306,9 +314,9 @@ impl MutVisitor for PlaceholderExpander {
 
     fn flat_map_assoc_item(
         &mut self,
-        item: P<ast::AssocItem>,
+        item: Box<ast::AssocItem>,
         ctxt: AssocCtxt,
-    ) -> SmallVec<[P<ast::AssocItem>; 1]> {
+    ) -> SmallVec<[Box<ast::AssocItem>; 1]> {
         match item.kind {
             ast::AssocItemKind::MacCall(_) => {
                 let it = self.remove(item.id);
@@ -324,8 +332,8 @@ impl MutVisitor for PlaceholderExpander {
 
     fn flat_map_foreign_item(
         &mut self,
-        item: P<ast::ForeignItem>,
-    ) -> SmallVec<[P<ast::ForeignItem>; 1]> {
+        item: Box<ast::ForeignItem>,
+    ) -> SmallVec<[Box<ast::ForeignItem>; 1]> {
         match item.kind {
             ast::ForeignItemKind::MacCall(_) => self.remove(item.id).make_foreign_items(),
             _ => walk_flat_map_foreign_item(self, item),
@@ -346,7 +354,7 @@ impl MutVisitor for PlaceholderExpander {
         }
     }
 
-    fn filter_map_expr(&mut self, expr: P<ast::Expr>) -> Option<P<ast::Expr>> {
+    fn filter_map_expr(&mut self, expr: Box<ast::Expr>) -> Option<Box<ast::Expr>> {
         match expr.kind {
             ast::ExprKind::MacCall(_) => self.remove(expr.id).make_opt_expr(),
             _ => walk_filter_map_expr(self, expr),
diff --git a/compiler/rustc_expand/src/proc_macro.rs b/compiler/rustc_expand/src/proc_macro.rs
index 84fbbbef061..9bfda8764f5 100644
--- a/compiler/rustc_expand/src/proc_macro.rs
+++ b/compiler/rustc_expand/src/proc_macro.rs
@@ -1,4 +1,3 @@
-use rustc_ast::ptr::P;
 use rustc_ast::tokenstream::TokenStream;
 use rustc_errors::ErrorGuaranteed;
 use rustc_parse::parser::{ForceCollect, Parser};
@@ -161,7 +160,7 @@ impl MultiItemModifier for DeriveProcMacro {
                 Ok(None) => break,
                 Ok(Some(item)) => {
                     if is_stmt {
-                        items.push(Annotatable::Stmt(P(ecx.stmt_item(span, item))));
+                        items.push(Annotatable::Stmt(Box::new(ecx.stmt_item(span, item))));
                     } else {
                         items.push(Annotatable::Item(item));
                     }
diff --git a/compiler/rustc_expand/src/stats.rs b/compiler/rustc_expand/src/stats.rs
index b4c4eac028f..3e40632275b 100644
--- a/compiler/rustc_expand/src/stats.rs
+++ b/compiler/rustc_expand/src/stats.rs
@@ -1,6 +1,5 @@
 use std::iter;
 
-use rustc_ast::ptr::P;
 use rustc_ast::{self as ast, DUMMY_NODE_ID, Expr, ExprKind};
 use rustc_ast_pretty::pprust;
 use rustc_span::hygiene::{ExpnKind, MacroKind};
@@ -41,7 +40,7 @@ pub(crate) fn update_bang_macro_stats(
     ecx: &mut ExtCtxt<'_>,
     fragment_kind: AstFragmentKind,
     span: Span,
-    mac: P<ast::MacCall>,
+    mac: Box<ast::MacCall>,
     fragment: &AstFragment,
 ) {
     // Does this path match any of the include macros, e.g. `include!`?