Fixed a problem where the environment was augmented twice with the same variable.
Fixed a problem where the environment was augmented twice with the same variable.

clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL