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Simon Peyton Jones authored
The new flag prints out a warning if you have a local, polymorphic binding that lacks a type signature. It's meant to help with the transition to the new typechecker, which discourages local let-generalisation. At the same time I moved the missing-signature code to TcHsSyn, where it takes place as part of zonking. That way the types are reported after all typechecking is complete, thereby fixing Trac #3696. (It's even more important for local bindings, which is why I made the change.)
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