Anecdote of "if" mandatory else clause being a win...
Porting some "#lang mzscheme" app code to "#lang racket/base", one of the tedious tasks is fixing all the "if" syntax that doesn't have an else clause. I decided to fix the "if" forms manually, rather than with Emacs macrology, just in case there was anything I didn't just want to make an "and". Doing it manually turned out to be fortunate, since Racket has already found *five* independent (i.e., not copy&pasted) locations where the programmers clearly intended to do "(if B E1 E2)", but instead did something else, usually "(if B E1) E2". I won't be surprised if I find a few more by the time all the code compiles.
Also, I doubt the programmers would have made these oopses, had they been using recent DrRacket, which does paren-matching that's hard to ignore. I'm probably going to make Quack force more prominent paren-matching than Emacs does by default. I'll also probably add my M-arrow sexp movement key bindings to Quack, to encourage sexp-based movement.
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