[downcast-rework-fusion]

[mccanne]

No description provided.

[nwt]

Could you make this change in lieu of skipping this test and adding the test below?

(I meant to do this myself in #6769.)

diff --git a/runtime/ztests/expr/function/defuse.yaml b/runtime/ztests/expr/function/defuse.yaml
index a3ad79964..9ff77b91a 100644
--- a/runtime/ztests/expr/function/defuse.yaml
+++ b/runtime/ztests/expr/function/defuse.yaml
@@ -39,8 +39,8 @@ input: &input |
   [[1::=a1]::=a2]::=a3
   |[|[1::=s1]|::=s2]|::=s3
   |{1::=m1:2::=m2}|::=m3
+  1::=u1::(u2=(u1|(u3=string)))
   "a"::(en1=enum(a,b))
-  1::=n1::(n2=n1|(n3=string))
   error(1::=er1)::=er2

 output: *input

[mccanne]

Ok, I enabled the test and made the change. It's now the only test failing on this branch under the new logic.