MatchLocalNames is an option for Trace and related functions which specifies whether symbols such as x should match symbols with local names of the form x
The default setting is MatchLocalNames
With the default setting, Trace[
] will show assignments to local variables whose names are of the form x
MatchLocalNames->False] shows assignments only for the global symbol x.
See the Mathematica book: Section 2.5.10.
This traces assignments to all variables with names of the form x$
This traces assignments only to the specific global variable x.
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