[ ghc-Bugs-904512 ] hiding does not follow haskell report

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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: mdg at wanadoo.fr

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:

mdg at mdglt:/bug-2111> cat Main.hs 
module Main where

import Prelude hiding (head)

main = do print (Prelude.head [0..])
          head

head = print "head"

mdg at mdglt:/bug-2112> ghc --version        
The Glorious Glasgow Haskell Compilation System,
version 6.0.1

mdg at mdglt:/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'

mdg at mdglt:/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'
mdg at mdglt:/bug-2115> runhugs Main
0
"head"

as expected.


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>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.

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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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