lean4-htt/tests/lean/1018unknowMVarIssue.lean

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inductive Fam2 : Type → Type → Type 1 where
| any : Fam2 α α
| nat : Nat → Fam2 Nat Nat
set_option pp.rawOnError true
set_option trace.Elab.info true
example (a : α) (x : Fam2 α β) : β :=
match x with
| Fam2.any => _
| Fam2.nat n => n