idris-0.12.3: libs/base/Debug/Trace.idr
module Debug.Trace
||| Print a message for debugging purposes as a side effect
||| @ msg what to print
||| @ result the final result
export
trace : (msg : String) -> (result : a) -> a
trace x val = unsafePerformIO {ffi=FFI_C} (do putStrLn x; pure val)