1 files changed, 24 insertions, 11 deletions

diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index e84d8f5b3..1a7ae4069 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -11,6 +11,7 @@ mod stmt;
 mod ty;
 
 use crate::lexer::UnmatchedDelim;
+use ast::Gen;
 pub use attr_wrapper::AttrWrapper;
 pub use diagnostics::AttemptLocalParseRecovery;
 pub(crate) use expr::ForbiddenLetReason;
@@ -35,8 +36,8 @@ use rustc_errors::{
     Applicability, DiagnosticBuilder, ErrorGuaranteed, FatalError, IntoDiagnostic, MultiSpan,
 };
 use rustc_session::parse::ParseSess;
-use rustc_span::source_map::{Span, DUMMY_SP};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
+use rustc_span::{Span, DUMMY_SP};
 use std::ops::Range;
 use std::{mem, slice};
 use thin_vec::ThinVec;
@@ -52,6 +53,7 @@ bitflags::bitflags! {
         const NO_STRUCT_LITERAL = 1 << 1;
         const CONST_EXPR        = 1 << 2;
         const ALLOW_LET         = 1 << 3;
+        const IN_IF_GUARD       = 1 << 4;
     }
 }
 
@@ -158,8 +160,9 @@ pub struct Parser<'a> {
     /// appropriately.
     ///
     /// See the comments in the `parse_path_segment` function for more details.
-    unmatched_angle_bracket_count: u32,
-    max_angle_bracket_count: u32,
+    unmatched_angle_bracket_count: u16,
+    max_angle_bracket_count: u16,
+    angle_bracket_nesting: u16,
 
     last_unexpected_token_span: Option<Span>,
     /// If present, this `Parser` is not parsing Rust code but rather a macro call.
@@ -393,6 +396,7 @@ impl<'a> Parser<'a> {
             break_last_token: false,
             unmatched_angle_bracket_count: 0,
             max_angle_bracket_count: 0,
+            angle_bracket_nesting: 0,
             last_unexpected_token_span: None,
             subparser_name,
             capture_state: CaptureState {
@@ -557,8 +561,9 @@ impl<'a> Parser<'a> {
         }
 
         if case == Case::Insensitive
-        && let Some((ident, /* is_raw */ false)) = self.token.ident()
-        && ident.as_str().to_lowercase() == kw.as_str().to_lowercase() {
+            && let Some((ident, /* is_raw */ false)) = self.token.ident()
+            && ident.as_str().to_lowercase() == kw.as_str().to_lowercase()
+        {
             true
         } else {
             false
@@ -586,12 +591,10 @@ impl<'a> Parser<'a> {
         }
 
         if case == Case::Insensitive
-        && let Some((ident, /* is_raw */ false)) = self.token.ident()
-        && ident.as_str().to_lowercase() == kw.as_str().to_lowercase() {
-            self.sess.emit_err(errors::KwBadCase {
-                span: ident.span,
-                kw: kw.as_str()
-            });
+            && let Some((ident, /* is_raw */ false)) = self.token.ident()
+            && ident.as_str().to_lowercase() == kw.as_str().to_lowercase()
+        {
+            self.sess.emit_err(errors::KwBadCase { span: ident.span, kw: kw.as_str() });
             self.bump();
             return true;
         }
@@ -1126,6 +1129,16 @@ impl<'a> Parser<'a> {
         }
     }
 
+    /// Parses genness: `gen` or nothing.
+    fn parse_genness(&mut self, case: Case) -> Gen {
+        if self.token.span.at_least_rust_2024() && self.eat_keyword_case(kw::Gen, case) {
+            let span = self.prev_token.uninterpolated_span();
+            Gen::Yes { span, closure_id: DUMMY_NODE_ID, return_impl_trait_id: DUMMY_NODE_ID }
+        } else {
+            Gen::No
+        }
+    }
+
     /// Parses unsafety: `unsafe` or nothing.
     fn parse_unsafety(&mut self, case: Case) -> Unsafe {
         if self.eat_keyword_case(kw::Unsafe, case) {