#5375: Regression in newName
---------------------------------+------------------------------------------
Reporter: reinerp | Owner:
Type: bug | Status: new
Priority: highest | Milestone: 7.2.1
Component: Template Haskell | Version: 7.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
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Comment(by reinerp):
So how do quasiquoters handle shadowing? For instance, what should we do
when we encounter the following:
{{{
f x = [some_quasi| ... (\x -> x)...|]
}}}
This should become
{{{
f x = ... (\x' -> x') ...
}}}
But I don't see how this would work if we used {{{lookupName}}} on all the
occurrences of {{{x}}} in the quasiquote.
Put in a different way, what would happen if I wrote this:
{{{
f x =
$(do
x' <- lookupName "x"
return $ LamE [VarP x'] (VarE x')
)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5375#comment:10>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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