balazske added a comment. It may be useful to make a "macro value map" kind of object. Some macros can be added to it as a string, and it is possible to lookup for an `Expr` if one of the added macros is used there. This can be done by checking the concrete (numeric) value of the `Expr` and compare to the value of the macro, or by checking if the expression comes from a macro and take this macro name (use string comparison). Such an object can be useful because the functionality is needed at more checkers, for example the ones I am working on (StreamChecker and ErrorReturnChecker too).
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