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97ee3d4cd3
We already did this, but missed a few cases due to the way arguments are elaborated. So now, when checking an LHS, we don't allow LHS argument types to be inferred from the pattern, but rather they must be inferred from elsewhere. To do this, we keep track of the constraints which would be solved when inferring the type, and make sure they don't solve any new metavariables. Fixes #1510, and also now gets the error location right as a bonus!
15 lines
382 B
Plaintext
15 lines
382 B
Plaintext
1/1: Building Cover (Cover.idr)
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Error: While processing left hand side of bad. Can't match on Just (fromInteger 0) as it must have a polymorphic type.
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Cover:14:6--14:12
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10 |
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11 | bad : a -> Foo a -> Bool
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12 | bad Z IsNat = False
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13 | bad True IsBool = True
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14 | bad (Just 0) _ = False
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^^^^^^
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Main> Main.okay: okay (S _) IsNat
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okay False IsBool
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Main> Bye for now!
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