/inline_depth command qualifier sets the maximum
level of function nesting, that is, calls to functions with calls
to functions and so forth, that KAP will attempt to trace. Higher
values cause KAP to recursively inline more deeply.
When run with
/inline_depth=1 , meaning inline only one
function deep, all the function references in the main program and
functions are expanded, but function references in inlined functions
/inline_depth=-1 were specified, only functions
s4 would be inlined. Repeated
/inline_depth=-1 could be performed to trace
functions further along the calling tree.