Auto merge of #77124 - spastorino:const-exprs-rfc-2920, r=oli-obk

Implement const expressions and patterns (RFC 2920)

cc `@ecstatic-morse` `@lcnr` `@oli-obk` `@petrochenkov`

3 files changed, 29 insertions, 3 deletions

diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index 17cbaf65420..fb05f8791a5 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -1060,6 +1060,8 @@ impl<'a> Parser<'a> {
             })
         } else if self.eat_keyword(kw::Unsafe) {
             self.parse_block_expr(None, lo, BlockCheckMode::Unsafe(ast::UserProvided), attrs)
+        } else if self.check_inline_const() {
+            self.parse_const_expr(lo.to(self.token.span))
         } else if self.is_do_catch_block() {
             self.recover_do_catch(attrs)
         } else if self.is_try_block() {
diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index c1094681221..7970ad36456 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -18,8 +18,9 @@ use rustc_ast::ptr::P;
 use rustc_ast::token::{self, DelimToken, Token, TokenKind};
 use rustc_ast::tokenstream::{self, DelimSpan, TokenStream, TokenTree, TreeAndSpacing};
 use rustc_ast::DUMMY_NODE_ID;
-use rustc_ast::{self as ast, AttrStyle, AttrVec, Const, CrateSugar, Extern, Unsafe};
-use rustc_ast::{Async, MacArgs, MacDelimiter, Mutability, StrLit, Visibility, VisibilityKind};
+use rustc_ast::{self as ast, AnonConst, AttrStyle, AttrVec, Const, CrateSugar, Extern, Unsafe};
+use rustc_ast::{Async, Expr, ExprKind, MacArgs, MacDelimiter, Mutability, StrLit};
+use rustc_ast::{Visibility, VisibilityKind};
 use rustc_ast_pretty::pprust;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, FatalError, PResult};
 use rustc_session::parse::ParseSess;
@@ -545,6 +546,11 @@ impl<'a> Parser<'a> {
         self.check_or_expected(self.token.can_begin_const_arg(), TokenType::Const)
     }
 
+    fn check_inline_const(&mut self) -> bool {
+        self.check_keyword(kw::Const)
+            && self.look_ahead(1, |t| t == &token::OpenDelim(DelimToken::Brace))
+    }
+
     /// Checks to see if the next token is either `+` or `+=`.
     /// Otherwise returns `false`.
     fn check_plus(&mut self) -> bool {
@@ -864,13 +870,28 @@ impl<'a> Parser<'a> {
 
     /// Parses constness: `const` or nothing.
     fn parse_constness(&mut self) -> Const {
-        if self.eat_keyword(kw::Const) {
+        // Avoid const blocks to be parsed as const items
+        if self.look_ahead(1, |t| t != &token::OpenDelim(DelimToken::Brace))
+            && self.eat_keyword(kw::Const)
+        {
             Const::Yes(self.prev_token.uninterpolated_span())
         } else {
             Const::No
         }
     }
 
+    /// Parses inline const expressions.
+    fn parse_const_expr(&mut self, span: Span) -> PResult<'a, P<Expr>> {
+        self.sess.gated_spans.gate(sym::inline_const, span);
+        self.eat_keyword(kw::Const);
+        let blk = self.parse_block()?;
+        let anon_const = AnonConst {
+            id: DUMMY_NODE_ID,
+            value: self.mk_expr(blk.span, ExprKind::Block(blk, None), AttrVec::new()),
+        };
+        Ok(self.mk_expr(span, ExprKind::ConstBlock(anon_const), AttrVec::new()))
+    }
+
     /// Parses mutability (`mut` or nothing).
     fn parse_mutability(&mut self) -> Mutability {
         if self.eat_keyword(kw::Mut) { Mutability::Mut } else { Mutability::Not }
diff --git a/compiler/rustc_parse/src/parser/pat.rs b/compiler/rustc_parse/src/parser/pat.rs
index 5aced9dc37c..15db2066a30 100644
--- a/compiler/rustc_parse/src/parser/pat.rs
+++ b/compiler/rustc_parse/src/parser/pat.rs
@@ -313,6 +313,9 @@ impl<'a> Parser<'a> {
             let pat = self.parse_pat_with_range_pat(false, None)?;
             self.sess.gated_spans.gate(sym::box_patterns, lo.to(self.prev_token.span));
             PatKind::Box(pat)
+        } else if self.check_inline_const() {
+            // Parse `const pat`
+            PatKind::Lit(self.parse_const_expr(lo.to(self.token.span))?)
         } else if self.can_be_ident_pat() {
             // Parse `ident @ pat`
             // This can give false positives and parse nullary enums,