7ed716f904
This PR improves the error messages produced by invalid projections and field notation. It also adds a hint to the "function expected" error message noting the argument to which the term is being applied, which can be helpful for debugging spurious "function expected" messages actually caused by syntax errors. --------- Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
33 lines
1 KiB
Text
33 lines
1 KiB
Text
holes.lean:4:4-4:7: error: A placeholder `_` cannot be used where a function is expected
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holes.lean:11:8-11:13: error: don't know how to synthesize placeholder
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context:
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case hole
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x : Nat
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y : Nat := g x + g x
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⊢ Nat
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holes.lean:11:4-11:5: error: don't know how to synthesize placeholder
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context:
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x : Nat
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y : Nat := ⋯
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⊢ Nat
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holes.lean:10:15-10:18: error: don't know how to synthesize implicit argument 'β'
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@g Nat (?m x) x
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context:
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x : Nat
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⊢ Type
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holes.lean:10:9-10:12: error: don't know how to synthesize implicit argument 'β'
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@g Nat (?m x) x
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context:
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x : Nat
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⊢ Type
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holes.lean:13:10-13:11: error: failed to infer binder type
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holes.lean:15:16-15:17: error: failed to infer binder type
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holes.lean:19:0-19:3: error: don't know how to synthesize implicit argument 'β'
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@f Nat (?m a) a
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context:
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a : Nat
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f : {α : Type} → {β : ?m a} → α → α := ⋯
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⊢ ?m a
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holes.lean:18:9-18:10: error: failed to infer binder type
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holes.lean:21:25-22:4: error: failed to infer type of `f7`
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holes.lean:25:8-25:11: error: failed to infer 'let rec' declaration type
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