Provide way to show the origin of a constraint
For a complex type (A b, C d, E e) => Something a b e -> Int, provide a way to given the query: where does A b come from? Respond with the line number of a function that causes that constraint. This should of course also work for non-Haskell 98 constraints.
This issue comes up when one by accident calls a function in the wrong layer of a monadic transformer stack.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.6.1 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | Unknown |
| Architecture | Unknown |
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