62f14514da
This PR updates various error messages produced by or associated with built-in tactics and adapts their formatting to current conventions.
110 lines
2.3 KiB
Text
110 lines
2.3 KiB
Text
/-!
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# Make sure `simpa` checks for metavariables in `using` clause
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https://github.com/leanprover/lean4/issues/5634
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-/
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set_option linter.unnecessarySimpa true
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/-!
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This used to have a "don't know how to synthesize placeholder" error on the `have` line too.
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This is because `have` is `refine_lift have ...; ?_`, so it indeed had a placeholder.
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-/
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/--
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error: don't know how to synthesize placeholder for argument 'a'
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context:
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htrue : True
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⊢ False
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---
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error: unsolved goals
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htrue : True
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h✝ : False
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⊢ False
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-/
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#guard_msgs in
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example : False := by
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have htrue : True := trivial
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simpa using id _
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/-!
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Simplified version of the test.
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-/
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/--
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error: don't know how to synthesize placeholder for argument 'a'
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context:
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⊢ False
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---
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error: unsolved goals
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h✝ : False
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⊢ False
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-/
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#guard_msgs in
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example : False := by
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refine ?_
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simpa using id ?_
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/-!
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Verifying that unassigned metavariables are OK, so long as they come from before elaboring the `using` clause.
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-/
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example (p : Prop) (h : p) : p := by
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have : ?a := ?b
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simpa using ?b
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exact h
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/-!
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Occurs check
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-/
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/--
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error: Occurs check failed: Expression
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?foo
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contains the goal ?foo
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-/
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#guard_msgs in
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example : False := by
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refine ?foo
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simpa using ?foo
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/-!
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Regression test: need to synthesize postponed metavariables before metavariable checks.
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-/
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example (α : Type) (x : α) : Nonempty α := by
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simpa using ⟨x⟩
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/-!
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Regression test: elaborates implicit arguments in the `using` clause
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-/
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noncomputable example (α : Type) [Nonempty α] : α := by
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simpa using fun {β : Type} [inst : Nonempty β] => Classical.choice inst
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/-!
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Regression test: elaborates using implicit lambda feature
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-/
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example (p : Prop) (h : p) : ∀ {_ : Nat}, p := by
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simpa using h
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/-!
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Regression test: make sure `simpa?` reports lemmas for both the goal and the `using` clause
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-/
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/-- info: Try this: simpa only [id] using h -/
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#guard_msgs in example (p : Prop) (h : p) : id p := by
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simpa? only [id] using h
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/-- info: Try this: simpa only [id] using h -/
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#guard_msgs in example (p : Prop) (h : id p) : p := by
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simpa? only [id] using h
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/-!
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Regression test: unnecessary `simpa`
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-/
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def foo (n : α) := [n]
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/--
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warning: Try `simp at h` instead of `simpa using h`
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Note: This linter can be disabled with `set_option linter.unnecessarySimpa false`
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-/
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#guard_msgs in
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example (h : foo n ≠ [n]) : False := by
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simpa [foo] using h
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