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extern int x1f4_look_shuffle
    (void *subtext, unsigned *line);

The x1f4_look_shuffle function stores some byte offset in the textual representation of the program for which the subtext step by step execution context was created at the address indicated by line. The offset may be indicative of the source position of the next instruction to be executed, and as well as of the source position of the instruction whose execution just failed (since instruction pointer is not advanced for execution failures). The function is intended to help with determining where and why the program execution failed.

The function returns 0.

It should be deployed for step by step program execution only. For single function call program execution consider x1f4_seek_shuffle.

See x1f4_seek_shuffle.

See Step By Step Procedural Program Execution.