Undef value `---` (for setting a value to be uninitialized/undefined)

1 files changed, 6 insertions, 1 deletions

diff --git a/src/check_decl.cpp b/src/check_decl.cpp
index 602e09a0a..d3f82b1d3 100644
--- a/src/check_decl.cpp
+++ b/src/check_decl.cpp
@@ -34,7 +34,12 @@ Type *check_init_variable(Checker *c, Entity *e, Operand *operand, String contex
 		Type *t = operand->type;
 		if (is_type_untyped(t)) {
 			if (t == t_invalid || is_type_untyped_nil(t)) {
-				error(e->token, "Use of untyped nil in %.*s", LIT(context_name));
+				error(e->token, "Invalid use of untyped nil in %.*s", LIT(context_name));
+				e->type = t_invalid;
+				return NULL;
+			}
+			if (t == t_invalid || is_type_untyped_undef(t)) {
+				error(e->token, "Invalid use of --- in %.*s", LIT(context_name));
 				e->type = t_invalid;
 				return NULL;
 			}