gccrs: Allow multiple outer attributes on generic params

Previously generic params only allowed one outer attribute in front of
them.

gcc/rust/ChangeLog:

	* ast/rust-ast-collector.cc (TokenCollector::visit): Visit outer
	attributes.
	* ast/rust-ast-visitor.cc (DefaultASTVisitor::visit): Change outer
	attribute visit, we need to visit all of them.
	* ast/rust-ast.cc (LifetimeParam::as_string): Change as_string
	implementation to allow multiple outer attributes.
	(TypeParam::as_string): Likewise.
	* ast/rust-ast.h (class LifetimeParam): Allow multiple outer
	attributes.
	* ast/rust-item.h (class TypeParam): Likewise.
	* ast/rust-path.h: Likewise.
	* parse/rust-parse-impl.h (Parser::parse_generic_param): Change call
	to outer attribute parsing to collect several attributes.
	(Parser::parse_lifetime_param): Likewise.
	(Parser::parse_type_param): Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/gcc/rust/ast/rust-ast-collector.cc b/gcc/rust/ast/rust-ast-collector.cc
index a7f6ed5..a757225 100644
--- a/gcc/rust/ast/rust-ast-collector.cc
+++ b/gcc/rust/ast/rust-ast-collector.cc
@@ -476,6 +476,7 @@ TokenCollector::visit (LifetimeParam &lifetime_param)
 
   // TODO what to do with outer attr? They are not mentioned in the reference.
 
+  visit_items_as_lines (lifetime_param.get_outer_attrs ());
   auto lifetime = lifetime_param.get_lifetime ();
   visit (lifetime);
 
@@ -495,6 +496,7 @@ TokenCollector::visit (ConstGenericParam &param)
   // Syntax:
   // const IDENTIFIER : Type ( = Block | IDENTIFIER | -?LITERAL )?
 
+  visit_items_as_lines (param.get_outer_attrs ());
   push (Rust::Token::make (CONST, param.get_locus ()));
   auto id = param.get_name ().as_string ();
   push (Rust::Token::make_identifier (UNDEF_LOCATION, std::move (id)));
@@ -1509,6 +1511,7 @@ TokenCollector::visit (TypeParam &param)
   // TypeParamBounds :
   //    TypeParamBound ( + TypeParamBound )* +?
 
+  visit_items_as_lines (param.get_outer_attrs ());
   auto id = param.get_type_representation ().as_string ();
   push (Rust::Token::make_identifier (param.get_locus (), std::move (id)));
   if (param.has_type_param_bounds ())