Parser fails on x-y

[nibro]

foo x y = fromIntegral $ x-y+1

Due to the HSX extension, x-y is considered a single identifier. The parser tries to be clever, but isn't clever enough when x-y is also combined with some other operator, e.g. x-y+1 above. Two possible resolutions:

1) Make the parser more clever. 2) Rule out x-y meaning a subtraction when the HSX extention is active.

Probably favor 2).

[Neil Mitchell]

This is the number 1 bug report in HLint, so would be a very useful fix.

[nibro]

I consider this bug fixed, though the overall library is still a bit in flux. But the darcs version of the library now only fails on the example program if the XmlSyntax? extension is given, otherwise it succeeds as expected.

When the XmlSyntax? is enabled, a programmer will need to put in spaces around the -. I consider that quite reasonable.