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).
47 lines
915 B
Text
47 lines
915 B
Text
set_option debug.proofAsSorry true
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set_option pp.mvars false
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/--
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error: type mismatch
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rfl
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has type
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?_ = ?_
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but is expected to have type
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2 + 2 = 5
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-/
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#guard_msgs in
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example : 2 + 2 = 5 := rfl -- This is not a theorem
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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theorem ex : 2 + 2 = 5 := id rfl -- id rfl to avoid the rfl attribute kicking in
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#guard_msgs in
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def data (w : Nat) : String := toString w
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/-- info: "37" -/
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#guard_msgs in
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#eval data 37
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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theorem tst1 : 0 + x = 1*x + 0 := by
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simp
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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theorem tst2 : ∀ x, 0 + x = 1*x + 0 := by
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intro x
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simp
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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theorem tst3 : x = 2*x + 1 := by
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rfl
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#guard_msgs in
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def concatSelf (as : List α) := as ++ as
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/-- info: [1, 2, 3, 1, 2, 3] -/
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#guard_msgs in
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#eval concatSelf [1, 2, 3]
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