Add concise types diffs to error messages #336
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Fixes #207 This expands Dhall's error messages to include concise "type diffs" whenever an actual type doesn't match an expected type. For example, here is an example diff for some small changes to a very large (6,159 lines) type: ``` dhall <<< '../dhall-to-cabal/dhall-to-cabal.dhall : ./type.dhall' Use "dhall --explain" for detailed errors Error: Expression doesn't match annotation { - license2 : … , + license : … , library : … ( ∀(… : { arch : ∀(… : < S390 : - Bool + {} | … > ) → … , … } ) → { build-tools : … { - version2 : … , + version : … , … } , default-extensions : … < - NamedWildCards2 : … | - UnboxedSums : … | + DataKinds : … | + NamedWildCards : … | … > , … } ) , … } ../dhall-to-cabal/dhall-to-cabal.dhall : ./type.dhall ``` These type diffs are always emitted (i.e. present even if the user does not supply the `--explain` flag).
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Fixes #207
This expands Dhall's error messages to include concise "type diffs"
whenever an actual type doesn't match an expected type. For example,
here is an example diff for some small changes to a very large (6,159
lines) type:
These type diffs are always emitted (i.e. present even if the user does
not supply the
--explainflag).