id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
210	Parse errors when TransformListComp extension is enabled	iago	nibro	"I'm experiencing many strange parse errors when parsing with all extensions enabled:

Parse error: l-i[[BR]]
Parse error: m-n[[BR]]
Parse error in expression: off_b +[[BR]]
Parse error: group[[BR]]
...

I know the code is fine because it actually compiles, the only thing I do before parse these files with haskell-src-exts is to run cpphs --noline over them, the output of cpphs is what I'm parsing.

I was able to isolate one of these faults (I could take a look on others if that helps):

The following module
{{{
Prelude Language.Haskell.Exts> f
""module Bar where\n\nimport Data.List ( group )\n\n""
}}}
is not correctly parsed when all known extensions are activated
{{{
Prelude Language.Haskell.Exts> parseModuleWithMode (defaultParseMode{extensions=knownExtensions}) f
ParseFailed (SrcLoc {srcFilename = ""<unknown>.hs"", srcLine = 3, srcColumn = 20}) ""Parse error: group""
}}}
but parsing without any extension enabled works
{{{
Prelude Language.Haskell.Exts> parseModule f
ParseOk (Module (SrcLoc {srcFilename = ""<unknown>.hs"", srcLine = 1, srcColumn = 1}) (ModuleName ""Bar"") [] Nothing Nothing [ImportDecl {importLoc = SrcLoc {srcFilename = ""<unknown>.hs"", srcLine = 3, srcColumn = 1}, importModule = ModuleName ""Data.List"", importQualified = False, importSrc = False, importPkg = Nothing, importAs = Nothing, importSpecs = Just (False,[IVar (Ident ""group"")])}] [])
}}}

Note: The exact version is the 1.10.1."	bug report	new	major		parser	1.10.0