Bugs item #759910, was opened at 2003-06-24 09:14
Message generated for change (Comment added) made by nobody
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Category: Compiler
Group: None
Status: Closed
Resolution: Wont Fix
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Non-exhaultive patterns from derived Read
Initial Comment:
When switching from GHC 5.04.1 to 6.0 I started getting
a load of warnings like these:
source/SDL/Types.hs:33:
Warning: Pattern match(es) are non-exhaustive
In a pattern binding in
a 'do' expression:
Patterns not matched:
Text.Read.Lex.EOF
Text.Read.Lex.Rat _
Text.Read.Lex.Int _
Text.Read.Lex.Symbol _
...
The source in question looks like this
data Expected
= ExpectedType String
| ExpectedValue String
deriving (Read, Show)
It looks as though everything deriving Read causes this
warning (there are several such constructs in the file).
Deriving only Show does not. Found no mention of
change to behavior of derived reads in release notes or in
google.
Cheers,
Jason Feingold
[EMAIL PROTECTED]
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Comment By: Nobody/Anonymous (nobody)
Date: 2003-09-10 14:09
Message:
Logged In: NO
You are correct, -fwarn-simple-patterns is enabled.
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Comment By: Simon Peyton Jones (simonpj)
Date: 2003-06-25 01:16
Message:
Logged In: YES
user_id=50165
You must be using -fwarn-simple-patterns too, right?
You're right that the error message is misleading, but it's not
particularly easy to fix, so I've settled for improving the
documentation of that flag.
----------------------------------------------------------------------
Comment By: Nobody/Anonymous (nobody)
Date: 2003-06-24 09:16
Message:
Logged In: NO
BTW, I'm running on Windows 2000.
----------------------------------------------------------------------
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