gccrs: Change lookup_module function return type

Wrap the return type into an optional.

gcc/rust/ChangeLog:

	* checks/errors/privacy/rust-visibility-resolver.cc: Update function
	call to match the new return type.
	* typecheck/rust-hir-type-check-path.cc (TypeCheckExpr::resolve_root_path):
	Likewise.
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::resolve_root_path):
	Likewise.
	* util/rust-hir-map.cc (Mappings::insert_module): Likewise.
	(Mappings::lookup_module): Change the function's return type.
	* util/rust-hir-map.h: Update the function's prototype.

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

2 files changed, 4 insertions, 4 deletions

diff --git a/gcc/rust/util/rust-hir-map.cc b/gcc/rust/util/rust-hir-map.cc
index 7c4fd1b..c77ffea 100644
--- a/gcc/rust/util/rust-hir-map.cc
+++ b/gcc/rust/util/rust-hir-map.cc
@@ -489,18 +489,18 @@ void
 Mappings::insert_module (HIR::Module *module)
 {
   auto id = module->get_mappings ().get_hirid ();
-  rust_assert (lookup_module (id) == nullptr);
+  rust_assert (!lookup_module (id));
 
   hirModuleMappings[id] = module;
   insert_node_to_hir (module->get_mappings ().get_nodeid (), id);
 }
 
-HIR::Module *
+tl::optional<HIR::Module *>
 Mappings::lookup_module (HirId id)
 {
   auto it = hirModuleMappings.find (id);
   if (it == hirModuleMappings.end ())
-    return nullptr;
+    return tl::nullopt;
 
   return it->second;
 }
diff --git a/gcc/rust/util/rust-hir-map.h b/gcc/rust/util/rust-hir-map.h
index da3aa9f..753e06f 100644
--- a/gcc/rust/util/rust-hir-map.h
+++ b/gcc/rust/util/rust-hir-map.h
@@ -138,7 +138,7 @@ public:
   tl::optional<HIR::ImplBlock *> lookup_impl_block_type (HirId id);
 
   void insert_module (HIR::Module *module);
-  HIR::Module *lookup_module (HirId id);
+  tl::optional<HIR::Module *> lookup_module (HirId id);
 
   void insert_hir_implitem (HirId parent_impl_id, HIR::ImplItem *item);
   HIR::ImplItem *lookup_hir_implitem (HirId id, HirId *parent_impl_id);