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lean4-htt/tests/lean/run/dsimp_proofs.lean
jrr6 62f14514da
refactor: update built-in tactic error messages (#9633) 
This PR updates various error messages produced by or associated with
built-in tactics and adapts their formatting to current conventions.
2025-07-31 14:16:57 +00:00

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@[simp]
theorem foo (i : Nonempty α) : Nonempty.intro (Classical.choice i) = i := rfl
/-- error: `dsimp` made no progress -/
#guard_msgs in
example : Classical.choice (Nonempty.intro (Classical.choice instNonemptyFloat)) = 0 := by
dsimp
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