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MARKER
Skip leading space delimiters. Parse name delimited by a space. Create a definition for name with the execution semantics defined below.
name Execution:
Restore all dictionary allocation and search order pointers to the state they had just prior to the definition of name. Remove the definition of name and all subsequent definitions. Restoration of any structures still existing that could refer to deleted definitions or deallocated data space is not necessarily provided. No other contextual information such as numeric base is affected.
See:
Rationale:
ContributeContributions
JennyBrien
Extending MARKERRequest for clarification2020-09-16 15:33:45
Many years ago, when I was modifying F-83 to be ANS-compilant, I had to temporarily patch several parts of the core. I used:
CHANGED \ n addr -- ; add addr and old value to a linked list and then store n at addr
I then modified FORGET
to run down the list and restore any values changed after that point.
Is there any common practice on how to add similar further "landmark information" that MARKER should restore?