8424ddbb3e
This PR improves the “expected type mismatch” error message by omitting the type's types when they are defeq, and putting them into separate lines when not. I found it rather tediuos to parse the error message when the expected type is long, because I had to find the `:` in the middle of a large expression somewhere. Also, when both are of sort `Prop` or `Type` it doesn't add much value to print the sort (and it’s only one hover away anyways).
49 lines
1.1 KiB
Text
49 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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