hsc2hs cannot open custom template file

Note: this happens to hsc2hs which comes with binary ghc-6.12.2.

hsc2hs from darcs.haskell.org seems to not have this issue

When invoking hsc2hs like this:

hsc2hs -t /dev/null HS_GLFW_H.hsc

(or any other filename with -t, the hsc file has its own template), the output follows:

hsc2hs: : openBinaryFile: does not exist (No such file or directory)

Note the second colon: filename should be there, and it is empty.

strace log shows that there is an attempt to open a file with empty name (ca. line 534):

open("", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE) = -1 ENOENT (No such file or directory)

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