Bugs item #759910, was opened at 2003-06-24 09:14
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https://sourceforge.net/tracker/?func=detail&atid=108032&aid=759910&group_id=8032
Category: Compiler
Group: None
Status: Open
Resolution: None
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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