+1 failing test: single variable assignment via let
+1 test pass: single variable assignment via let
+1 failing test: single variable assignment via let
+1 test pass: single variable assignment via let
+1 failing test: if nested on let
+1 test pass: if nested on let
+1 failing test: variable eval nested on call on let block
+1 test pass: variable eval nested on call on let block