simon/Monkey: Writing An Interpreter In Go @ 21a07afa7bb3eae236a889fc460b32f9ebda8245

simon 21a07afa7b built-in function: len()		%!s(int64=3) %!d(string=hai) anos
..
builtins.go	21a07afa7b built-in function: len()	%!s(int64=3) %!d(string=hai) anos
evaluator.go	ca0563df26 built-in function: len()	%!s(int64=3) %!d(string=hai) anos
evaluator_test.go	ca0563df26 built-in function: len()	%!s(int64=3) %!d(string=hai) anos