1 files changed, 12 insertions, 1 deletions
diff --git a/bootstrap/types.c b/bootstrap/types.c
index 66ae840..37977ea 100644
--- a/bootstrap/types.c
+++ b/bootstrap/types.c
@@ -301,6 +301,16 @@ constifychild(const struct type *ty) {
    return interntype(ty2);
 }
 
+const struct type *
+unconstifychild(const struct type *ty) {
+   struct type ty2 = *ty;
+   const struct type *child = unconstify(ty->child);
+   if (child == ty->child)
+      return ty;
+   ty2.child = child;
+   return interntype(ty2);
+}
+
 static const struct type *
 arraydecay(const struct type *ty) {
    struct type ty2 = *ty;
@@ -367,7 +377,7 @@ typeof2(const struct type *a, const struct type *b) {
       b = arraydecay(b);
    if (a->t == TYarr && b->t == TYptr)
       a = arraydecay(a);
-   if (a->t == TYptr && b->t == TYptr) {
+   if (a->t == b->t && (a->t == TYptr || a->t == TYslice)) {
       bool akonst = a->child->konst,
            bkonst = b->child->konst;
       const struct type *uac = unconstify(a->child),
@@ -396,6 +406,7 @@ typeof2(const struct type *a, const struct type *b) {
       }
 
    }
+
    return NULL;
 }