The macro with-modification-check-macro, together with the macro with-modification-change, provides a way for a body of code to execute and check whether there was any "modification" during this execution, where modification is execution of some other piece of code.
with-modification-check-macro defines a lexical macro (by macrolet) with the name macro-name which takes no arguments, and is used to check whether there was any change since entering the body.
modification-place must be initialized to a fixnum. It must not be modified by any code except with-modification-change.
See Aids for implementing modification checks for the full description and an example.
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