lean4-htt/tests/lean/run/issue2883.lean
Joachim Breitner 9800e066bc
fix: PackMutual: Deal with extra arguments (#2892)
previously, it would ignore a recursive call that has extra arguments,
which can happen when the recursive functions return something of
function type. Therefore just leave them extra arguments in place.

Fixes #2883.
2023-11-20 17:07:50 +01:00

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Text

/-!
Test that PackMutual isn't confused when a recursive call has more arguments than is packed
into the unary argument, which can happen if the retturn type is a function type.
-/
mutual
inductive A : Type
| baseA : A
| fromB : B → A
inductive B : Type
| fromA : A → B
end
mutual
def foo : B → Prop
| .fromA a => bar a 0
def bar : A → Nat → Prop
| .baseA => (fun _ => True)
| .fromB b => (fun (c : Nat) => ∃ (t : Nat), foo b)
end
termination_by
foo x => sizeOf x
bar x => sizeOf x