'#' becomes an illegal first-character of a QuasiQuote line when CPP is enabled
{-# LANGUAGE CPP #-} <pre> [hamlet| #{foo} |] </pre>
This will fail to compile. CPP should skip over a quasi-quote, which is allowed to have any characters. I think the only use case for CPP inside QQ is trying to place a QQ into an external file. In Yesod, we accomplish this with Template Haskell.
Our ideal situation would be for GHC to provide a function loadQQ. This would make it simple to not need #include. But my real hope is that loadQQ will identify the external file as a dependency and automatically recompile that code as needed.
Trac metadata
Trac field | Value |
---|---|
Version | 7.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | michael@snoyman.com |
Operating system | |
Architecture |