Make HLint ignore parse error due to multi-way if?

Question

I'm using the MultiWayIf language extension. While I love HLint (I'm using version v1.8.61), unfortunately it appears that HLint is not aware of this extension, and it reports multi-way ifs as parse errors: Warning: Parse error: |

The HLint Manual (http://community.haskell.org/~ndm/darcs/hlint/hlint.htm) describes how you can use pragmas to indicate suggestions to ignore; however, this doesn't seem to work for warnings due to parse errors.

Is there any way to tell HLint to ignore the parse error warnings? Thank you!

Witkowski

What version of haskell-src-exts is it linked with? The changelog for HSE says it added support for MultiWayIf in 1.15. – William

Answer 1

You can run:

hlint "--ignore=Parse error" MyFile.hs

There is a test that this invocation works in the HLint test suite.

Note that as soon as there is a parse error you won't get any other hints from the file, since HLint can't operate on a file until it is parsed.

However, if you upgrade to haskell-src-exts-1.15 or higher then reinstall HLint it should parse multi-way-if fine. If not, please report a bug.

Fewness

Upgrading haskell-src-exts and reinstalling HLint (cabal install --reinstall hlint) worked for me. Thank you very much! – Witkowski