Typically, what I do is just map the indent and dedent tokens directly to some suitable bracket pair, so the implementation is trivial. As for the infinite arg

Typically, what I do is just map the indent and dedent tokens directly to some suitable bracket pair, so the implementation is trivial. As for the infinite arguments, well, as a language designer, is that really your problem? I mean, that kind of stylistic argument is no different from the endless arguments about bracket placement in C-like languages, or comma placement, "a+b" versus "a + b", and so on. People quibble about the dumbest things, I say just let them.