5f4e6a86d5
This PR updates the formatting of, and adds explanations for, "unknown identifier" errors as well as "failed to infer type" errors for binders and definitions. It attempts to ameliorate some of the confusion encountered in #1592 by modifying the wording of the "header is elaborated before body is processed" note and adding further discussion and examples of this behavior in the corresponding error explanation.
31 lines
1 KiB
Text
31 lines
1 KiB
Text
-- set_option trace.Meta.FunInd true
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def myTest {α}
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(mmotive : (x : List α) → Sort v)
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(x : List α)
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(h_1 : (a : α) → (dc : List α) → x = a :: dc → mmotive (a :: dc))
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(h_2 : (x' : List α) → x = x' → mmotive x') : mmotive x :=
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match (generalizing := false) h : x with
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| a :: dc => h_1 a dc h
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| x' => h_2 x' h
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/--
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error: Failed to realize constant myTest.fun_cases:
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Cannot derive functional cases principle (please report this issue)
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failed to transform matcher, type error when constructing new pre-splitter motive:
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myTest.match_1 (fun x => motive x h_1 h_2) x
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failed with
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Application type mismatch: The argument
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h_1
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has type
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(a : α) → (dc : List α) → x = a :: dc → mmotive (a :: dc)
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but is expected to have type
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(a : α) → (dc : List α) → x✝ = a :: dc → mmotive (a :: dc)
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in the application
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motive x✝ h_1
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---
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error: Unknown identifier `myTest.fun_cases`
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-/
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#guard_msgs in
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def foo := @myTest.fun_cases
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