Your SAS code snippet works with my SAS system -- possibly you have not shared additional info about other SAS code that may have been executed previously, in the same SAS session?
Scott Barry
SBBWorks, Inc.
NOTE: SAS initialization used:
real time 2.08 seconds
cpu time 1.12 seconds
1 options mlogic mprint;
2 %LET First=SAS;
3 %LET Second=Program;
4 %LET both=&First&Second;
5 %PUT The results are: &First,&Second,---&both.ming;
The results are: SAS,Program,---SASProgramming