Less greedily parse [const] bounds

Author: fmease

compiler/rustc_parse/src/parser/ty.rs

@@ -1015,12 +1015,18 @@ impl<'a> Parser<'a> {
             || self.check(exp!(Tilde))
             || self.check_keyword(exp!(For))
             || self.check(exp!(OpenParen))
-            || self.check(exp!(OpenBracket))
+            || self.can_begin_maybe_const_bound()
             || self.check_keyword(exp!(Const))
             || self.check_keyword(exp!(Async))
             || self.check_keyword(exp!(Use))
     }
 
+    fn can_begin_maybe_const_bound(&mut self) -> bool {
+        self.check(exp!(OpenBracket))
+            && self.look_ahead(1, |t| t.is_keyword(kw::Const))
+            && self.look_ahead(2, |t| *t == token::CloseBracket)
+    }
+
     /// Parse a bound.
     ///
     /// ```ebnf
@@ -1199,10 +1205,7 @@ impl<'a> Parser<'a> {
             let span = tilde.to(self.prev_token.span);
             self.psess.gated_spans.gate(sym::const_trait_impl, span);
             BoundConstness::Maybe(span)
-        } else if self.check(exp!(OpenBracket))
-            && self.look_ahead(1, |t| t.is_keyword(kw::Const))
-            && self.look_ahead(2, |t| *t == token::CloseBracket)
-        {
+        } else if self.can_begin_maybe_const_bound() {
             let start = self.token.span;
             self.bump();
             self.expect_keyword(exp!(Const)).unwrap();

tests/ui/traits/const-traits/macro-maybe-const-trait-bounds.rs

@@ -0,0 +1,18 @@
+// FIXME(fmease): Explainer.
+
+//@ check-pass (KEEP THIS AS A PASSING TEST!)
+
+macro_rules! check {
+    ($ty:ty) => { compile_error!("ty"); }; // KEEP THIS RULE FIRST AND AS IS!
+
+    (dyn [$($any:tt)*] Trait) => { /* KEEP THIS EMPTY! */ };
+    (impl [$($any:tt)*] Trait) => { /* KEEP THIS EMPTY! */ };
+}
+
+check!(dyn [T] Trait);
+
+// issue: <https://github.com/rust-lang/rust/issues/146417>
+check!(impl [T] Trait);
+check!(impl [T: Bound] Trait);
+
+fn main() {}