Added test for BLOCK-AST and RETURN-FROM-AST.
Added test for BLOCK-AST and RETURN-FROM-AST.

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