Getting a function traceback in C

Often when you get close to a programming error, you want to know how you got into that situation, and especially what the traceback of calling functions is. To get this information, issue the command:

LIST CALLS ;

For example, if you run the CALC example with the commands:

AT ENTRY read_token ;
GO ;
LIST CALLS ;

the Log window will contain something like:

At ENTRY in C function CALC ::> "USERID.MFISTART.C(READTOKN)" :> read_token.
From LINE 18 in C function CALC ::> "USERID.MFISTART.C(CALC)" :> main :> %BLOCK2.

which shows the traceback of callers.