If a %LET statement generates an error, it's possible that MCOMPILENOTE may not catch the error. For example:

   /** Sample code that generates an error **/
   options mcompilenote=all;
   %macro test;
     %let y 100;
   %mend;  

   /** Log from running above code **/
   1    options mcompilenote=all;
   2
   3    %macro test;
   4     %let y 100;
   ERROR: Expected equal sign not found in %LET statement.
   5    %mend;
   NOTE: The macro TEST completed compilation without errors.
         2 instructions 4 bytes.

Notice that MCOMPILENOTE incorrectly states that the macro compiled without errors.

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