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    Avoid segfault when ticky file argument is stderr · ed95d86d authored
    If you compiled a program with -ticky and ran it with:
    ./foo +RTS -rstderr -RTS
    the result would be a segfault. This was because the RTS interprets stderr to
    mean "use debugBelch to print out messages," and sets the ticky file pointer
    to NULL as a result, but PrintTickyInfo (the function in Ticky.c that prints
    out the ticky report) wasn't checking for NULL.
    I changed PrintTickyInfo to check whether the ticky file pointer is NULL and 
    output to stderr if so.
    Also removed an unused import from CodeOutput.lhs.