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test: add test for #879

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The new `termination_by` syntax should address issue #879

closes #879
This commit is contained in:
Leonardo de Moura 2022-01-12 16:25:09 -08:00
parent 7fe6881c42
commit 98864f707e
2 changed files with 4 additions and 1 deletions
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3
tests/lean/run/879.lean Normal file
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@ -0,0 +1,3 @@
variable (a : Nat)
def foo (b c : Nat) := if h : b = 0 then a + c else foo (b - 1) c
termination_by _ => b

2
tests/lean/run/ack.lean
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@ -2,4 +2,4 @@ def ack : Nat → Nat → Nat
| 0, y => y+1
| x+1, 0 => ack x 1
| x+1, y+1 => ack x (ack (x+1) y)
termination_by' PSigma.lex sizeOfWFRel (fun _ => sizeOfWFRel)
termination_by _ a b => (a, b)