Improve error messages for the Focus macro.
#1413
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yilinwei
requested review from
julien-truffaut,
cquiroz and
xuwei-k
as code owners
- Correctly widen inferred singleton types for the error message. - Propagate the position information for user errors.
yilinwei
commented
Dec 20, 2023
| def getFieldSymbol(fromTypeSymbol: Symbol): Symbol = { | ||
| // We need to do this to support tuples, because even though they conform as case classes in other respects, | ||
| // for some reason their field names (_1, _2, etc) have a space at the end, ie `_1 `. | ||
| val f: String => String = |
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This fixes a silent error if we have something like
case class Foo(x: Int, `x `: Int)since identifiers with leading/trailing spaces are not equivalent.
yilinwei
commented
Dec 20, 2023
| def errorMessage(error: FocusError): String = error match { | ||
| case FocusError.NotACaseClass(fromClass, fieldName) => | ||
| s"Cannot generate Lens for field '$fieldName', because '$fromClass' is not a case class" | ||
| def errorReport(error: FocusError): (String, Option[Position]) = error match { |
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The dotty macro API has better support for errors now.
As a tangent, I need to see whether we can use the -explain flag which would be helpful to expand internal errors.
julien-truffaut
approved these changes
Dec 21, 2023
|
Thanks @yilinwei, it looks good to me! |
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A few random changes which are (mostly) forced by compiler changes.
I think I'll change the hierarchy of the
FocusErrora little, because some of the errors are internal i.e.5xxand some are4xx; mixing them is quite confusing.