Page 112 refers to a non-existant function "fn()" in the text.

[WraithGlade]

On page 112, the text describes the call stack as being:

fn() → fn_b() → fn_c()

However, this is wrong. There is no function named fn() defined anywhere in the given source code.

A better way to describe the call stack at that time would be:

main() → fn_b() → fn_c()

[JLospinoso]

Thanks, @WraithGlade!