In contrast to most other languages, Forth has no strict boundary
between compilation and run-time. E.g., you can run arbitrary code
between defining words (or for computing data used by defining words
like constant). Moreover, Immediate (see section 5.10 Interpretation and Compilation Semantics and [...] (see below) allow
running arbitrary code while compiling a colon definition (exception:
you must not allot dictionary space).
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