ea20911a85
previously, only the WellFounded code was making use of the error location in the RecApp-metadata. We can do the same for structural recursion. This way, ``` def f (n : Nat) : Nat := match n with | 0 => 0 | n + 1 => f (n + 1) ``` will show the error with squiggly lines under `f (n + 1)`, and not at `def f`.
14 lines
430 B
Text
14 lines
430 B
Text
wf1.lean:3:12-3:19: error: fail to show termination for
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g
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with errors
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argument #1 was not used for structural recursion
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failed to eliminate recursive application
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g (x - 1)
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argument #2 was not used for structural recursion
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insufficient number of parameters at recursive application
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g (x - 1)
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structural recursion cannot be used
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failed to prove termination, use `termination_by` to specify a well-founded relation
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