runghc from standard input and --ghc-args

I am trying to use runghc with a cabal sandbox, and it works when the haskell code is in a file like follows:

runghc -- -package-db --ghc-arg=.cabal-sandbox/i386-linux-ghc-7.6.3-packages.conf.d somefile.hs

But if I try and load the script from standard input (actually I am trying to run a GHC script from a bash script using "runghc << EOF" but it is easier to see if you just run from the console)

runghc -- -package-db --ghc-arg=.cabal-sandbox/i386-linux-ghc-7.6.3-packages.conf.d < somefile.hs

you get an error

.cabal-sandbox/i386-linux-ghc-7.6.3-packages.conf.d/:1:57:
    Not in scope: `main'
    Perhaps you meant `min' (imported from Prelude)

Looking at the utils/runghc/runghc.hs source file, what happens is inside the doIt function. The first thing the doIt function does is call getGhcArgs which strips the --ghc-args. Then it checks the args and sees there is no file, so falls into the case where it reads standard input, creates a temp file, and then recalls doIt. Here is the problem, because the "--ghc-arg" string has already been stripped so the second call to doIt is where the error occurs.

With that, I can actually get it to work with the following :)

runghc -- -package-db --ghc-arg=--ghc-arg=.cabal-sandbox/i386-linux-ghc-7.6.3-packages.conf.d < somefile.hs

By passing --ghc-arg= twice, it is stripped once the first time doIt is called and once the second time and GHC gets the correct args :)

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture