#2723: Unnecessary warning for record wildcards
---------------------------------+------------------------------------------
Reporter: judah | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.3 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown/Multiple | Os: Unknown/Multiple
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When compiling a file with record wildcards, -Wall produces a warning
about shadowed bindings. Since the presence of a wildcard indicates that
the shadowing was intentional, this warning seems unnecessary.
I reproduced this with both 6.8.3 and 6.10.0.20081007:
{{{
{-# LANGUAGE RecordWildCards #-}
module WildCard where
data Record = Record {field1 :: Int, field2 :: Double}
test :: Record
test = let
field1 = 10
field2 = 10.0
in Record {..}
}}}
{{{
$ ghc --make -Wall WildCard.hs
[1 of 1] Compiling WildCard ( WildCard.hs, WildCard.o )
WildCard.hs:8:4:
Warning: This binding for `field1' shadows the existing binding
defined at WildCard.hs:4:22
In the binding group for: field1, field2
WildCard.hs:9:4:
Warning: This binding for `field2' shadows the existing binding
defined at WildCard.hs:4:37
In the binding group for: field1, field2
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2723>
GHC <http://www.haskell.org/ghc/>
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