compiler: Handle _ with explicit type correctly.

From-SVN: r183358

gcc/go/gofrontend/parse.cc

@@ -1883,10 +1883,23 @@ Parse::init_var(const Typed_identifier& tid, Type* type, Expression* init,
     {
       if (!type_from_init && init != NULL)
 	{
-	  if (!this->gogo_->in_global_scope())
+	  if (this->gogo_->in_global_scope())
+	    return this->create_dummy_global(type, init, location);
+	  else if (type == NULL)
 	    this->gogo_->add_statement(Statement::make_statement(init, true));
 	  else
-	    return this->create_dummy_global(type, init, location);
+	    {
+	      // With both a type and an initializer, create a dummy
+	      // variable so that we will check whether the
+	      // initializer can be assigned to the type.
+	      Variable* var = new Variable(type, init, false, false, false,
+					   location);
+	      static int count;
+	      char buf[30];
+	      snprintf(buf, sizeof buf, "sink$%d", count);
+	      ++count;
+	      return this->gogo_->add_variable(buf, var);
+	    }
 	}
       return this->gogo_->add_sink();
     }