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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #15354
Closed
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Issue created Jul 08, 2018 by Richard Eisenberg@raeDeveloper

QuantifiedConstraints not fully described in manual

As pointed out in ticket:15351#comment:156470, the section in the manual on -XQuantifiedConstraints says that an => is essential in a quantified constraint. However, the following is accepted:

class C a

foo :: (forall x. C x) => ()
foo = ()

Note that there is no => in the quantified constraint. We need to update the manual accordingly.

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Version 8.5
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Documentation
Test case
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