[committed 04/88] gccrs: rust: add bound parsing in parse_generic_arg.

[arthur . cohen]

From: mxlol233 <mxlol...@outlook.com>

gcc/rust/ChangeLog:

        * parse/rust-parse-impl.h (Parser::parse_generic_arg): Add proper bound 
parsing.

gcc/testsuite/ChangeLog:

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

Signed-off-by: Xiao Ma <mxlol...@outlook.com>
---
 gcc/rust/parse/rust-parse-impl.h     | 17 +++++++++++++++++
 gcc/testsuite/rust/compile/bounds.rs | 10 ++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 gcc/testsuite/rust/compile/bounds.rs

diff --git a/gcc/rust/parse/rust-parse-impl.h b/gcc/rust/parse/rust-parse-impl.h
index cbd40efcc9b..959e0338a10 100644
--- a/gcc/rust/parse/rust-parse-impl.h
+++ b/gcc/rust/parse/rust-parse-impl.h
@@ -6198,6 +6198,23 @@ Parser<ManagedTokenSource>::parse_generic_arg ()
            else
              return AST::GenericArg::create_error ();
          }
+       else if (next_tok->get_id () == COLON)
+         {
+           lexer.skip_token (); // skip ident
+           lexer.skip_token (); // skip colon
+
+           auto tok = lexer.peek_token ();
+           std::vector<std::unique_ptr<AST::TypeParamBound>> bounds
+             = parse_type_param_bounds ();
+
+           auto type = std::unique_ptr<AST::TraitObjectType> (
+             new AST::TraitObjectType (std::move (bounds), tok->get_locus (),
+                                       false));
+           if (type)
+             return AST::GenericArg::create_type (std::move (type));
+           else
+             return AST::GenericArg::create_error ();
+         }
        lexer.skip_token ();
        return AST::GenericArg::create_ambiguous (tok->get_str (),
                                                  tok->get_locus ());
diff --git a/gcc/testsuite/rust/compile/bounds.rs 
b/gcc/testsuite/rust/compile/bounds.rs
new file mode 100644
index 00000000000..ecb10d81f65
--- /dev/null
+++ b/gcc/testsuite/rust/compile/bounds.rs
@@ -0,0 +1,10 @@
+trait Foo {
+    type Bar;
+}
+
+trait Copy {}
+
+
+fn c<F: Foo<Bar: Foo>>() where F::Bar: Copy { // { dg-warning "function is 
never used: 'c'" }
+}
+
-- 
2.40.0