Handle async functions declarations in traits

gcc/rust/ChangeLog: * parse/rust-parse-impl.h (Parser::parse_trait_item): Add switch-case for ASYNC token. gcc/testsuite/ChangeLog: * rust/compile/issue-2785.rs: New test. Signed-off-by: Kushal Pal <[email protected]>
Rust-GCC · Jan 3, 2024 · 9c67db4 · 9c67db4
1 parent a12143b
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diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
@@ -5087,6 +5087,11 @@ Parser<ManagedTokenSource>::parse_trait_item ()
     {
     case TYPE:
       return parse_trait_type (std::move (outer_attrs), vis);
+    // may need to implement `parse_trait_async()`
+    case ASYNC:
+      add_error (Error (tok->get_locus (),
+			"functions in traits cannot be declared %<async%>"));
+      return nullptr;
     case CONST:
       // disambiguate with function qualifier
       if (lexer.peek_token (1)->get_id () == IDENTIFIER)

diff --git a/gcc/testsuite/rust/compile/issue-2785.rs b/gcc/testsuite/rust/compile/issue-2785.rs
@@ -0,0 +1,7 @@
+// { dg-additional-options "-frust-edition=2018" }
+trait Foo {
+    async fn foo();
+    // { dg-error "functions in traits cannot be declared .async." "" { target *-*-* } .-1 }
+}
+
+fn main() {}