This module introduce functions that have identical types with functions in the Debug.Trace module.

You might write some programs like this:

import Debug.Trace

fib 0 = 1
fib 1 = 1
fib n = ("fib " ++ show n) `trace` fib (n - 1) + fib (n - 2)

And after you finish the debugging process, just change the line

import Debug.Trace

into

import Debug.NoTrace

Then all the tracing functions are silently removed.