fab1897f28
This PR adds a `with_unfolding_none` tactic that sets the transparency mode to `.none`, in which no definitions are unfolded. This complements the existing `with_unfolding_all` tactic and provides tactic-level access to the `TransparencyMode.none` added in https://github.com/leanprover/lean4/pull/11810. 🤖 Prepared with Claude Code Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
25 lines
682 B
Text
25 lines
682 B
Text
/-!
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# Tests for `with_unfolding_none` tactic
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The `.none` transparency mode prevents unfolding of all definitions, including reducible ones.
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This is stricter than `.reducible`, which unfolds `@[reducible]` definitions.
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-/
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-- A reducible definition: unfolded by `.reducible` but not by `.none`
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@[reducible] def myId (x : Nat) : Nat := x
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-- Default transparency can see through myId
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example : myId 42 = 42 := by rfl
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-- with_unfolding_none blocks even reducible definitions
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/--
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error: Tactic `rfl` failed: The left-hand side
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myId 42
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is not definitionally equal to the right-hand side
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42
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⊢ myId 42 = 42
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-/
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#guard_msgs in
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example : myId 42 = 42 := by
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with_unfolding_none rfl
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