Sema: adjust coercion of undefined error union payload

To no longer set the error code to undefined. This fixes the problem
where an undefined single-item pointer coerced to an error union of a
slice set the whole thing to undefined even though the sub-coercion to
the slice would have produced a defined value.

1 files changed, 0 insertions, 5 deletions

diff --git a/src/Sema.zig b/src/Sema.zig
index afb97f3b3d..09f99c5751 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -18140,11 +18140,6 @@ fn coerce(
                 return sema.addConstUndef(dest_ty);
             },
             else => {
-                // undefined sets the error code also to undefined.
-                if (is_undef) {
-                    return sema.addConstUndef(dest_ty);
-                }
-
                 // T to E!T
                 return sema.wrapErrorUnionPayload(block, dest_ty, inst, inst_src);
             },