SafeHaskell permits OPTIONS_GHC pragmas
This can be used to launch arbitrary processes at compile-time, and possibly other dangerous things as well. For example, I'm curious if it would be possible to override trust with OPTIONS_GHC -trust foo...
Test case, using the hsx preprocessor for XML literals:
{-# LANGUAGE Safe #-}
{-# OPTIONS_GHC -F -pgmF trhsx #-}
img = <img/>The resulting error suggest that the trhsx program was in deed launched:
pp.hs:3:8: Not in scope: `genEElement'Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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