Some functions are inlined by the compiler and not caught by the tracing. See if there's anything that can be done in this situation, so that either the underlying function gets traced or the user gets informed of the situation:
iex(1)> Rexbug.start("Integer")
{82, 25}
iex(2)> Integer.to_string(3)
"3"
redbug done, timeout - 0
iex(3)> i &Integer.to_string/1
Term
&:erlang.integer_to_binary/1
Data type
Function
Type
external
Arity
1
Implemented protocols
Enumerable, IEx.Info, Inspect
Some functions are inlined by the compiler and not caught by the tracing. See if there's anything that can be done in this situation, so that either the underlying function gets traced or the user gets informed of the situation: