3a457e6ad6
Many of our tests in `tests/lean/run/` produce output from `#eval` (or `#check`) statements, that is then ignored. This PR tries to capture all the useful output using `#guard_msgs`. I've only done a cursory check that the output is still sane --- there is a chance that some "unchecked" tests have already accumulated regressions and this just cements them! In the other direction, I did identify two rotten tests: * a minor one in `setStructInstNotation.lean`, where a comment says `Set Nat`, but `#check` actually prints `?_`. Weird? * `CompilerProbe.lean` is generating empty output, apparently indicating that something is broken, but I don't know the signficance of this file. In any case, I'll ask about these elsewhere. (This started by noticing that a recent `grind` test file had an untested `trace_state`, and then got carried away.)
17 lines
631 B
Text
17 lines
631 B
Text
variable {α : Type _} [Mul α] [Inhabited α]
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abbrev Left (a : α) : α := a * default
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abbrev Right (a : α): α := default * a
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theorem mul_comm (a b : α) : a * b = b * a := sorry
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set_option trace.Meta.Tactic.simp true
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/--
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info: [Meta.Tactic.simp.rewrite] @mul_comm:1000:perm, perm rejected Left a ==> default * a
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[Meta.Tactic.simp.rewrite] @mul_comm:1000:perm, Right a ==> a * default
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[Meta.Tactic.simp.rewrite] @mul_comm:1000:perm, perm rejected a * default ==> default * a
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[Meta.Tactic.simp.rewrite] @eq_self:1000, Left a = a * default ==> True
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-/
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#guard_msgs in
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example (a : α) : Left a = Right a := by
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simp [mul_comm]
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