calling <procedure> on [+ 2 2]
[+ 2 2]
calling <procedure> on [a b hello 41.9 [xxx]]
[a b hello 41.9 [xxx]]
calling <procedure> on [1 2 3]
[1 2 3]
calling <procedure> on [= total [+ [* sum filter] total]]
[= total [+ [* sum filter] total]]
calling <procedure> on [= total [+ [* sum filter] total]]
[= total [+ [* sum filter] total]]
calling <procedure> on 42
42
calling <procedure> on [val x]
[val x]
