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).
24 lines
370 B
Text
24 lines
370 B
Text
/-!
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# Tests for the `have` tactic.
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-/
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/-!
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If the body of a `have` fails to elaborate, the tactic completes with a `sorry` for the proof.
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-/
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/--
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error: type mismatch
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False.elim
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has type
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False → ?m.6
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but is expected to have type
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True
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---
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trace: h : True
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⊢ True
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-/
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#guard_msgs in
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example : True := by
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have h : True :=
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False.elim
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trace_state
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assumption
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