gleam-lang/gleam
Ver no GitHubEmphasize mismatching part of complex type mismatches
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#4.578 aberto em 9 de mai. de 2025
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Description
When a type mismatch is complex, and some types are unbound (is this the correct term?), it can be hard to see where the error actually is. Here is a concrete example I actually wasted quite a bit of time on:
Expected type:
drift.Step(List(String), Input, Output, Nil)
Found type:
drift.Step(List(string), Input, a, b)
It could be made clearer by emphasizing where the type mismatch was exactly:
Expected type:
drift.Step(List(String), Input, Output, Nil)
^^^^^^
Found type:
drift.Step(List(string), Input, a, b)
^^^^^^