Don't crash using value of something with no value.

From-SVN: r168982

diff --git a/gcc/go/gofrontend/types.cc b/gcc/go/gofrontend/types.cc
index dd0a861d49feba51bddb1a5f32ae983f2577a3e3..840de2ba82f36c14f03338d7a0550543a393ec65 100644 (file)
--- a/gcc/go/gofrontend/types.cc
+++ b/gcc/go/gofrontend/types.cc
@@ -482,6 +482,15 @@ bool
 Type::are_assignable(const Type* lhs, const Type* rhs, std::string* reason)
 {
   // Do some checks first.  Make sure the types are defined.
+  if (rhs != NULL
+      && rhs->forwarded()->forward_declaration_type() == NULL
+      && rhs->is_void_type())
+    {
+      if (reason != NULL)
+       *reason = "non-value used as value";
+      return false;
+    }
+
   if (lhs != NULL && lhs->forwarded()->forward_declaration_type() == NULL)
     {
       // Any value may be assigned to the blank identifier.