Bugs item #904512, was opened at 2004-02-25 12:15
Message generated for change (Comment added) made by sigbjorn
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Category: Compiler
Group: 6.0.1
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: hiding does not follow haskell report
Initial Comment:
Email: [EMAIL PROTECTED]
As understand hiding from the Haskell report, it should
hide only the unqualified name and not the qualified name,
e.g., hide head but not Prelude.head (or List.head). This
is not the case with ghc 6.0.1:
[EMAIL PROTECTED]:/bug-2111> cat Main.hs
module Main where
import Prelude hiding (head)
main = do print (Prelude.head [0..])
head
head = print "head"
[EMAIL PROTECTED]:/bug-2112> ghc --version
The Glorious Glasgow Haskell Compilation System,
version 6.0.1
[EMAIL PROTECTED]:/bug-2113> ghc -fglasgow-exts -o Main --make Main
Chasing modules from: Main
Compiling Main ( Main.hs, ./Main.o )
Main.hs:5: Variable not in scope: `Prelude.head'
[EMAIL PROTECTED]:/bug-2114> ghc -o Main --make Main
Chasing modules from: Main
Compiling Main ( Main.hs, ./Main.o )
Main.hs:5: Variable not in scope: `Prelude.head'
[EMAIL PROTECTED]:/bug-2115> runhugs Main
0
"head"
as expected.
----------------------------------------------------------------------
>Comment By: Sigbjorn Finne (sigbjorn)
Date: 2004-02-26 07:20
Message:
Logged In: YES
user_id=232905
This is not a bug, but expected behaviour. See the examples
table in Section 5.3.4 of the Haskell 98 report.
----------------------------------------------------------------------
Comment By: Simon Peyton Jones (simonpj)
Date: 2004-02-26 04:38
Message:
Logged In: YES
user_id=50165
Quite right! Thus bug has been there for ages, but no one
(including us) noticed.
I'm going to fix the HEAD. It turns out to be more awkward
to fix the 6.2 branch, so I'll let it lie.
----------------------------------------------------------------------
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