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.)
29 lines
696 B
Text
29 lines
696 B
Text
import Lean
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-- The `cases` tactic does not use `Lean.Meta.cases` under the hood,
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-- so it is unaffected by this issue. We define a tactic
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-- `mcases` that delegates to `Lean.Meta.cases`.
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syntax (name := mcases) "mcases" ident : tactic
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namespace Lean.Elab.Tactic
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@[tactic mcases]
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def evalMcases : Tactic
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| `(tactic| mcases $hyp) => do
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let hyp ← getFVarId hyp
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liftMetaTactic fun goal => do
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let goals ← goal.cases hyp
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return goals.map (·.mvarId) |>.toList
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| _ => unreachable!
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end Lean.Elab.Tactic
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example : True := by
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let h : ∃ n, n = 0 := ⟨0, rfl⟩
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mcases h
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sorry -- sorry
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example : True := by
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have h : ∃ n, n = 0 := ⟨0, rfl⟩
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mcases h
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apply True.intro
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