9e241a4087
This PR reverts #12000, which introduced a regression where `simp` incorrectly rejects valid rewrites for perm lemmas. The issue is that `NameGenerator.mkChild` creates names that don't maintain the ordering assumption used by `acLt` for perm lemma decisions. For example, after the change: - Child generator creates names like `_uniq.102.2` - Parent continues with `_uniq.7` - But `Name.lt (.num (.num `_uniq 102) 2) (.num `_uniq 7)` is true This causes fvars created later (in async tasks) to compare as smaller than fvars created earlier, breaking the assumption that later fvars compare greater according to `Name.lt`. Fixes #12136. 🤖 Prepared with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
31 lines
598 B
Text
31 lines
598 B
Text
import Lean.Elab.Tactic.Basic
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/-!
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Kernel errors should not lead to follow-up errors but should be detectable using `#print axioms`.
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-/
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/-- error: (kernel) declaration has metavariables 'bad' -/
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#guard_msgs in
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def bad : Empty := by
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run_tac do Lean.Elab.Tactic.popMainGoal
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theorem zero_eq_one : 0 = 1 := bad.elim
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/--
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info: def bad : Empty :=
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?_uniq.3
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-/
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#guard_msgs in
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set_option pp.raw true in
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#print bad
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/--
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info: theorem zero_eq_one : 0 = 1 :=
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Empty.elim bad
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-/
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#guard_msgs in
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#print zero_eq_one
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/-- info: 'zero_eq_one' depends on axioms: [bad] -/
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#guard_msgs in
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#print axioms zero_eq_one
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