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).
123 lines
2.5 KiB
Text
123 lines
2.5 KiB
Text
/-!
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# Tests of the `sorry` term elaborator
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-/
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set_option pp.mvars false
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/-!
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Basic usage.
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-/
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in example : False := sorry
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in example : False := by sorry
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/-!
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Pretty printing
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-/
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/-- info: sorry : Nat -/
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#guard_msgs in #check (sorry : Nat)
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/-- info: fun x => sorry : Nat → Nat -/
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#guard_msgs in #check fun x : Nat => (sorry : Nat)
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/-- info: fun x => sorry (x + 1) : Nat → Nat -/
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#guard_msgs in #check fun x : Nat => (sorry : Nat → Nat) (x + 1)
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/-!
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Uniqueness
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-/
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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example : (sorry : Nat) = sorry := by
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fail_if_success rfl
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sorry
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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def f (n : Nat) : Nat → Nat := sorry
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example : f 0 0 = f 0 0 := rfl -- succeeds
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/-!
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If `sorry` is used for a function type, then one gets a family of unique `sorry`s.
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-/
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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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f 0 1 = f 0 0
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-/
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#guard_msgs in example : f 0 1 = f 0 0 := rfl
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/-!
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It is not completely unique though. The `sorry` did not pay attention to variables in the local context.
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-/
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#guard_msgs in example : f 1 0 = f 0 0 := rfl
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/-!
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Showing source position when surfacing differences.
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-/
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-- note: the module name is `sorry` and not `lean.run.sorry` in the testing environment,
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-- so this test fails in VS Code.
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/--
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error: type mismatch
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sorry
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has type
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sorry `«sorry:77:43»
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but is expected to have type
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sorry `«sorry:77:25»
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-/
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#guard_msgs in example : sorry := (sorry : sorry)
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/-!
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Elaboration errors are just labeled, not unique, to limit cascading errors.
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-/
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/--
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error: unknown identifier 'a'
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---
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error: unknown identifier 'b'
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---
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trace: ⊢ sorry = sorry
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-/
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#guard_msgs in
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set_option autoImplicit false in
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example : a = b := by trace_state; rfl
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/-!
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Showing that the sorries in the previous test are labeled.
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-/
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/--
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error: unknown identifier 'a'
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---
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error: unknown identifier 'b'
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---
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trace: ⊢ sorry `«sorry:106:10» = sorry `«sorry:106:14»
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-/
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#guard_msgs in
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set_option autoImplicit false in
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set_option pp.sorrySource true in
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example : a = b := by trace_state; rfl
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/-!
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The local context should show `sorry` without showing its source position.
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This requires `Lean.Widget.ppExprTagged` to have a pretty printing mode that doesn't override any pretty printing options.
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https://github.com/leanprover/lean4/issues/6715
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-/
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/--
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trace: n : Nat := sorry
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⊢ True
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---
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warning: declaration uses 'sorry'
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-/
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#guard_msgs in
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example : True := by
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let n : Nat := sorry
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trace_state
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trivial
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