loop stack overview

Each Muq job ("thread") has two stacks:

• Data stack, used for expression evaluation.
• Loop stack, used for local variables, return addresses and so forth.

The data stack is directly visible to the MUF programmer, and holds a simple unstructured sequences of values.

The loop stack has a more intricate structure consisting essentially of typed records of various lengths. For a full discussion of loop stacks, see section `Loop Stacks' in Loop Stacks.

The functions in this section provide ways to inspect and modify the other-wise inaccessable loop stack contents. They are intended primarily for use in debuggers.

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