Look, I really enjoy whitespace sensitive languages, and I generally think braceless syntax looks nice, but holy hell the rules for parsing it are bonkers. Consider: (bar: y) => z bar: y => z foo.bar: x => z Remember the *tooling* has to handle multiple versions of the language, even when the compiler doesn’t, and the second one is just straight up ambiguous, while the third requires a ton of backtracking to avoid the ambiguity.