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Fix error localization #218
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Related to #217 Two type-checking steps shift and substitute expressions: * Function application * `let` expressions (only more recently, in acd06c) However, the `shift` and `subst` functions have the undesirable property that they (unnecessarily) strip `Note` constructors. As a result, any type-checking step that involves either `Let` or `App` may produce poor error localization. The solution is to modify `shift` and `subst` to note remove `Note` constructors and instead split that functionality out into a new `denote` function. Fixing this greatly improves error localization.
This is a definite improvement! Here's a diff of a meaty error it helped with. Before
After
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Awesome! Thanks for the review :) |
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Related to #217
Two type-checking steps shift and substitute expressions:
let
expressions (only more recently, in acd06c)However, the
shift
andsubst
functions have the undesirable propertythat they (unnecessarily) strip
Note
constructors. As a result, anytype-checking step that involves either
Let
orApp
may produce poor errorlocalization.
The solution is to modify
shift
andsubst
to note removeNote
constructors and instead split that functionality out into a new
denote
function. Fixing this greatly improves error localization.