rock -vv sam.use
[lang/Backtrace] Falling back on execinfo.. (build extension if you want fancy backtraces)
[Exception in FileReader]: Couldn't open sam.use for reading: No such file or directory(SIGABRT) abort program
rock(lang_Backtrace__BacktraceHandler_backtrace_impl+0xe0) [0x581df0]
rock(lang_Exception__Exception_getCurrentBacktrace+0x13) [0x56c483]
rock(lang_Exception___signalHandler+0x134) [0x56c5e4]
/lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7fd13f8374b0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38) [0x7fd13f837428]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x16a) [0x7fd13f83902a]
rock(lang_Exception__Exception_throw_impl+0x50) [0x56d910]
rock(io_FileReader__FileReader_new_withFile+0x136) [0x585c86]
rock(rock_middle_UseDef__UseDef_read_impl+0x36) [0x526366]
rock(rock_frontend_CommandLine__CommandLine_prepareCompilationFromUse_impl+0x6d) [0x4a53bd]
rock(rock_frontend_CommandLine__CommandLine_init+0x567) [0x4a5c27]
rock(rock_frontend_CommandLine__CommandLine_new+0x5e) [0x4a7e0e]
rock(main+0xa2) [0x4a4142]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7fd13f822830]
rock(_start+0x29) [0x4a4179]