gccrs: lower: Correctly lower parenthesized types

This is useful for handling multiple trait bounds, and required for better handling of auto traits.

gcc/rust/ChangeLog:

	* hir/rust-ast-lower-type.cc (ASTLoweringType::visit): Add implementation for
	ParenthesizedType.
	* hir/rust-ast-lower-type.h: Declare that new visitor.

gcc/testsuite/ChangeLog:

	* rust/compile/auto_traits1.rs: New test.

1 files changed, 27 insertions, 0 deletions

diff --git a/gcc/testsuite/rust/compile/auto_traits1.rs b/gcc/testsuite/rust/compile/auto_traits1.rs
new file mode 100644
index 0000000..192052d
--- /dev/null
+++ b/gcc/testsuite/rust/compile/auto_traits1.rs
@@ -0,0 +1,27 @@
+// { dg-additional-options "-frust-compile-until=typecheck" }
+
+#![feature(optin_builtin_traits)]
+
+pub unsafe auto trait Send {}
+#[lang = "sync"]
+pub unsafe auto trait Sync {}
+
+trait A {
+    fn a_method(&self) {}
+}
+
+fn foo(a: &(dyn A + Send + Sync)) {
+    a.a_method();
+}
+
+struct S;
+
+impl A for S {
+    fn a_method(&self) {}
+}
+
+fn main() {
+    let s = S;
+
+    foo(&s);
+}