34bd6e8bfd
This PR improves the error messages produced by the `split` tactic, including suggesting syntax fixes and related tactics with which it might be confused. Note that, to avoid clashing with the new error message styling conventions used in these messages, this PR also updates the formatting of the message produced by `throwTacticEx`. Closes #6224
52 lines
1.1 KiB
Text
52 lines
1.1 KiB
Text
/--
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error: Tactic `apply` failed: could not unify the type of `x`
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PUnit.{1}
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with the goal
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PUnit.{0}
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x : PUnit
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⊢ PUnit
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-/
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#guard_msgs in
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example (x : PUnit.{1}) : PUnit.{0} := by
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apply x
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/--
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error: type mismatch
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x
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has type
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PUnit.{1}
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of sort `Type` but is expected to have type
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PUnit.{0}
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of sort `Prop`
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-/
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#guard_msgs in
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example (x : PUnit.{1}) : PUnit.{0} :=
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x
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/--
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error: Tactic `rfl` failed: the left-hand side
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∀ (x : PUnit.{1}), True
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is not definitionally equal to the right-hand side
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∀ (x : PUnit.{2}), True
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⊢ (∀ (x : PUnit), True) ↔ ∀ (x : PUnit), True
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-/
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#guard_msgs in
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example : (∀ _ : PUnit.{1}, True) ↔ ∀ _ : PUnit.{2}, True := by
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rfl
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inductive Test where
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| mk (x : Prop)
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/--
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error: Tactic `rfl` failed: the left-hand side
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(Test.mk (∀ (x : PUnit.{1}), True)).1
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is not definitionally equal to the right-hand side
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(Test.mk (∀ (x : PUnit.{2}), True)).1
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⊢ (Test.mk (∀ (x : PUnit), True)).1 = (Test.mk (∀ (x : PUnit), True)).1
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-/
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#guard_msgs in
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example : (Test.mk (∀ _ : PUnit.{1}, True)).1 = (Test.mk (∀ _ : PUnit.{2}, True)).1 := by
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rfl
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