data _null_;
x = ’a token’;
call symput(’myvar1’,x);
run;
%put ** Inside the macro: **;
%put _user_;
%mend env1;
%env1(10)
%put ** In open code: **;
%put _user_;
data temp;
y = "&myvar1"; /* ERROR - MYVAR1 is not available in open code. */
run;
这一段话什么意思?



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