Generate error for async trait fucntions

Fixes #2767 gcc/rust/ChangeLog: * checks/errors/rust-ast-validation.cc (ASTValidation::visit): Added check for `async` function inside trait. gcc/testsuite/ChangeLog: * rust/compile/issue-2767.rs: New test. Signed-off-by: Kushal Pal <[email protected]>
Rust-GCC · Dec 27, 2023 · 7bb5d5c · 7bb5d5c
1 parent b2e1131
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diff --git a/gcc/rust/checks/errors/rust-ast-validation.cc b/gcc/rust/checks/errors/rust-ast-validation.cc
@@ -107,6 +107,11 @@ ASTValidation::visit (AST::Function &function)
     rust_error_at (function.get_locus (), ErrorCode::E0379,
 		   "functions in traits cannot be declared const");
 
+  // may change soon
+  if (qualifiers.is_async () && context.back () == Context::TRAIT_IMPL)
+    rust_error_at (function.get_locus (), ErrorCode::E0706,
+		   "functions in traits cannot be declared %<async%>");
+
   if (valid_context.find (context.back ()) == valid_context.end ()
       && function.has_self_param ())
     rust_error_at (

diff --git a/gcc/testsuite/rust/compile/issue-2767.rs b/gcc/testsuite/rust/compile/issue-2767.rs
@@ -0,0 +1,13 @@
+// { dg-additional-options "-frust-edition=2018" }
+trait Foo {
+    fn f() -> u32;
+}
+
+impl Foo for u32 {
+    async fn f() -> u32 {
+        // { dg-error "functions in traits cannot be declared .async." "" { target *-*-* } .-1 }
+        22
+    }
+}
+
+fn main() {}