b5122b6a7b
This change * moves `termination_by` and `decreasing_by` next to the function they apply to * simplify the syntax of `termination_by` * apply the `decreasing_by` goal to all goals at once, for better interactive use. See the section in `RELEASES.md` for more details and migration advise. This is a hard breaking change, requiring developers to touch every `termination_by` in their code base. We decided to still do it as a hard-breaking change, because supporting both old and new syntax at the same time would be non-trivial, and not save that much. Moreover, this requires changes to some metaprograms that developers might have written, and supporting both syntaxes at the same time would make _their_ migration harder.
85 lines
1.8 KiB
Text
85 lines
1.8 KiB
Text
/-!
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This module tests various mis-uses of termination_by and decreasing_by:
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* use in non-recursive functions
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* that all or none of a recursive group have termination_by.
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-/
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def nonRecursive1 (n : Nat) : Nat := n
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termination_by n -- Error
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def nonRecursive2 (n : Nat) : Nat := n
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decreasing_by sorry -- Error
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def nonRecursive3 (n : Nat) : Nat := n
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termination_by n -- Error
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decreasing_by sorry
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partial def partial1 (n : Nat) : Nat := partial1 n
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termination_by n -- Error
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partial def partial2 (n : Nat) : Nat := partial2 n
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decreasing_by sorry -- Error
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partial def partial3 (n : Nat) : Nat := partial3 n
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termination_by n -- Error
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decreasing_by sorry
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unsafe def unsafe1 (n : Nat) : Nat := unsafe1 n
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termination_by n -- Error
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unsafe def unsafe2 (n : Nat) : Nat := unsafe2 n
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decreasing_by sorry -- Error
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unsafe def unsafe3 (n : Nat) : Nat := unsafe3 n
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termination_by x -- Error
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decreasing_by sorry
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unsafe def withWhere (n : Nat) : Nat := foo n
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where foo (n : Nat) := n
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termination_by n -- Error
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unsafe def withLetRec (n : Nat) : Nat :=
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let rec foo (n : Nat) := n
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termination_by n -- Error
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foo n
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mutual
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def rec : Nat → Nat
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| 0 => 0
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| n+1 => rec n + notrec n
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termination_by x => x
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def notrec (n : Nat) : Nat := n
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termination_by n -- Error
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end
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mutual
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def isEven : Nat → Bool
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| 0 => true
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| n+1 => isOdd n
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termination_by x => x
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def isOdd : Nat → Bool -- Error
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| 0 => false
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| n+1 => isEven n
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end
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namespace Test
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mutual
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def f : Nat → α → α → α
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| 0, a, b => a
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| n+1, a, b => g n a b |>.1
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termination_by n _ _ => n
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def g : Nat → α → α → (α × α)
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| 0, a, b => (a, b)
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| n+1, a, b => (h n a b, a)
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termination_by n _ _ => n
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def h : Nat → α → α → α -- Error
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| 0, a, b => b
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| n+1, a, b => f n a b
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end
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end Test
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