#5275: Data.Typeable not backwards compatible
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Reporter: augustss | Owner: simonmar
Type: bug | Status: new
Priority: high | Milestone: 7.2.1
Component: libraries/base | Version: 7.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
strictly speaking, in 7.1 `tyConString` changed only for the built-in
types for which instances were declared in `Data.Typeable`, because we
switched from using CPP macros to declare the instances to using
standalone deriving. In 7.2 we'll be changing the `tyConString` for
derived instances to match the behaviour of `tyConString` in the CPP macro
instances in 7.0.
So for the built-in types, we'll be reverting to the 7.0 behaviour, and
for all other types the `tyConSting`s will change.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5275#comment:8>
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