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
48 lines
1.2 KiB
Text
48 lines
1.2 KiB
Text
set_option pp.mvars false
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/--
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error: type mismatch
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congrArg ?_ (congrArg ?_ ?_)
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has type
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?_ (?_ ?_) = ?_ (?_ ?_)
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but is expected to have type
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OfNat.ofNat 0 = OfNat.ofNat 1
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-/
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#guard_msgs in
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theorem ex1 : (@OfNat.ofNat Nat 0 Zero.toOfNat0) = @OfNat.ofNat Nat 1 One.toOfNat1 := by
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refine congrArg _ (congrArg _ ?_)
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rfl
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/--
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error: Tactic `apply` failed: could not unify the conclusion of `@congrArg`
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?_ ?_ = ?_ ?_
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with the goal
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OfNat.ofNat 0 = OfNat.ofNat 1
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Note: The full type of `@congrArg` is
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∀ {α : Sort _} {β : Sort _} {a₁ a₂ : α} (f : α → β), a₁ = a₂ → f a₁ = f a₂
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⊢ OfNat.ofNat 0 = OfNat.ofNat 1
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-/
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#guard_msgs in
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example : (@OfNat.ofNat Nat 0 Zero.toOfNat0) = @OfNat.ofNat Nat 1 One.toOfNat1 := by
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apply congrArg
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apply congrArg
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apply rfl
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/--
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error: Tactic `apply` failed: could not unify the conclusion of `@congrArg`
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?_ ?_ = ?_ ?_
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with the goal
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OfNat.ofNat 0 = OfNat.ofNat 1
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Note: The full type of `@congrArg` is
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∀ {α : Sort _} {β : Sort _} {a₁ a₂ : α} (f : α → β), a₁ = a₂ → f a₁ = f a₂
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⊢ OfNat.ofNat 0 = OfNat.ofNat 1
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-/
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#guard_msgs in
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theorem ex2 : (@OfNat.ofNat Nat 0 Zero.toOfNat0) = @OfNat.ofNat Nat 1 One.toOfNat1 := by
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apply congrArg
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apply congrArg
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apply rfl
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