14d76cc062
This PR tries to preserve names of pattern variables in match alternatives in `decreasing_by`, by telescoping into the concrete alternative rather than the type of the matcher's alt. Fixes #10976.
16 lines
291 B
Text
16 lines
291 B
Text
-- The variable names should be `a1` and `b1`
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/--
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error: Failed: `fail` tactic was invoked
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a1 b1 : Nat
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⊢ a1 + b1 < a1.succ + b1.succ
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-/
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#guard_msgs in
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def f (a b : Nat) := match a with
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| 0 => 0
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| a1+1 => match b with
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| 0 => 0
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| b1+1 => f a1 b1
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termination_by a+b
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decreasing_by
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fail
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