#5529: Newtypes with hidden constructors cannot be passed as FFI arguments
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Reporter: mikhail.vorozhtsov | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by mikhail.vorozhtsov):
Yes, that's why I said that types should be marked "with corresponding C
types" (maybe "tagged" would be a better word). When a programmer
"matches" newtypes from other Haskell libraries with the types of
arguments of the C function he wants to import, he does it by '''name'''.
'''I''' don't need to know how exactly, say, CTime is represented to
"match" it with time_t, '''compiler''' does. My point is that while
exporting constructors does expose representation to GHC's FFI checking
code, it also exposes it to programmers that use the module. And I don't
think that the former should require/force the latter. I want to have
control over the export list, compiler can use other means of making
representation accessible to it's own code.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5529#comment:6>
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