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.
13 lines
228 B
Text
13 lines
228 B
Text
def foo (n : Nat) : Nat :=
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if n = 0 then 0 else
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let x := n - 1
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have := match () with | _ => trivial
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foo x
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termination_by n
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decreasing_by sorry
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theorem ex : foo 0 = 0 := by
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unfold foo
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sorry
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#check foo._unfold
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