lean4-htt/tests/lean/run/1380.lean
Joachim Breitner da2b91558e
feat: improve simp trace formatting (#6951)
This PR adds line breaks and indentations to simp's trace messages to
make them easier to read (IMHO).
2025-02-04 15:47:01 +00:00

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variable (n v₁ v₂) (hv₁: v₁ < n + 1) (hv₂: v₂ < n + 1)
theorem foo (_: ¬ Fin.mk v₂ hv₂ = Fin.mk v₁ hv₁ ): True := trivial
/--
info: [Meta.Tactic.simp.unify] eq_self:1000, failed to unify
?a = ?a
with
⟨v₂, hv₂⟩ = ⟨v₁, hv₁⟩
[Meta.Tactic.simp.rewrite] Fin.mk.injEq:1000:
⟨v₂, hv₂⟩ = ⟨v₁, hv₁⟩
==>
v₂ = v₁
[Meta.Tactic.simp.unify] eq_self:1000, failed to unify
?a = ?a
with
v₂ = v₁
[Meta.Tactic.simp.discharge] Nat.ne_of_gt discharge ✅️
v₁ < v₂
[Meta.Tactic.simp.rewrite] hv:1000:
v₁ < v₂
==>
True
[Meta.Tactic.simp.rewrite] Nat.ne_of_gt:1000: v₂ = v₁ ==> False
-/
#guard_msgs in
set_option trace.Meta.Tactic.simp true in
example (hv: v₁ < v₂) : True := foo n v₁ v₂ _ _ (by simp (config := { decide := true }) only [hv, Fin.mk.injEq, Nat.ne_of_gt, Nat.lt_succ_iff])
#check Fin.mk.injEq