1 files changed, 4 insertions, 2 deletions
diff --git a/src/util.cff b/src/util.cff
index 70c80b4..9bb5db9 100644
--- a/src/util.cff
+++ b/src/util.cff
@@ -81,8 +81,10 @@ extern fn fatal(P *Parser, loc Loc, fmt *const u8, ...) void {
 extern fn internstr(s *const u8) *const u8 {
    static set Set<*const u8, struct {
       fn hash(s *const u8) u32 { return fnv1a_s(FNV1A_INI, s); }
-      fn eq(a *const u8, b *const u8) bool { return streq(a, b);  }
-      fn dup(s *const u8) *const u8 { return as(*const u8)xstrdup(s); }
+      fn eq(a *const u8, b *const u8) bool {
+         return a != #null and b != #null and streq(a, b);
+      }
+      fn dup(s *const u8) *const u8 { return xstrdup(s); }
    }> = {};
    return *set->intern(s);
 }