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  • Glasgow Haskell Compiler
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  • #1451

Closed
Open
Created Jun 22, 2007 by iampure@gmail.com@trac-iampure

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
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Operating system Unknown
Architecture Unknown
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