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.
6 lines
175 B
Text
6 lines
175 B
Text
def foo : Nat → Nat → Nat
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| 0, 0 => 1
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| s+1, 0 => foo s 0 + 1
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| 0, b+1 => foo 0 b + 1
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| s+1, b+1 => foo (s+1) b + foo s (b+1)
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termination_by b s => (b, s)
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