Nested macro definition causes :Open code statement recursion detected. however move the nested macro definition to outside of main macro will cure the code. But why? Syntax-wise they are both valid. Anyone can explain to me? Thank you.   ####### %macro upcaseDSN(dsn); %macro NameWithoutLibOpt(dsn); %if %index(&dsn,.) %then %scan(&dsn,2,%str(.%()); %else %scan(&dsn,1,%str(.%()); %mend; %upcase(%NameWithoutLibOpt(&dsn)) %mend; %put %upcaseDSN(%str(sashelp.class(keep=age))); %* expect to see CLASS but failed; Error message 252 253 254 %macro upcaseDSN(dsn); 255 %macro NameWithoutLibOpt(dsn); 256 %if %index(&dsn,.) %then %scan(&dsn,2,%str(.%()); 257 %else %scan(&dsn,1,%str(.%()); 258 %mend; 259 %upcase(%NameWithoutLibOpt(&dsn)) 260 %mend; 261 %put %upcaseDSN(%str(sashelp.class(keep=age))); MLOGIC(UPCASEDSN): Beginning execution. MLOGIC(UPCASEDSN): Parameter DSN has value
sashelp.class(keepage) ERROR: Open code statement recursion detected. SYMBOLGEN: Macro variable DSN resolves to sashelp.class(keep=age) SYMBOLGEN: Some characters in the above value which were subject to macro quoting have been unquoted for printing. ERROR: Expected %DO not found. ERROR: Skipping to next %END statement. modified code are fine. but why? %macro NameWithoutLibOpt(dsn); %if %index(&dsn,.) %then %scan(&dsn,2,%str(.%()); %else %scan(&dsn,1,%str(.%()); %mend; %macro upcaseDSN(dsn); %upcase(%NameWithoutLibOpt(&dsn)) %mend; %put %upcaseDSN(%str(sashelp.class(keep=age))); %* get CLASS by moving nested macro out ; 273 %* get CLASS by moving nested macro out ; 274 option nosymbolgen nomlogic; 275 %macro NameWithoutLibOpt(dsn); 276 %if %index(&dsn,.) %then %scan(&dsn,2,%str(.%()); 277 %else %scan(&dsn,1,%str(.%()); 278 %mend; 279 280 %macro upcaseDSN(dsn); 281 282 %upcase(%NameWithoutLibOpt(&dsn)) 283 %mend; 284 %put %upcaseDSN(%str(sashelp.class(keep=age))); CLASS 285 %* get CLASS by moving nested macro out ; ... View more