Eliminating "seemingly unnecessary" braces

language design
13

I'm very much in favor of mandatory braces, but I do think there's a third path here. Rust has augmented if and while statements with if let Some(x) = x {} and while let Some(x) = x {}, taking advantage of reserved keywords to avoid the ambiguity and accidental assignments that are common in C code.

We could do something similar and augment for loops to have an optional match keyword:

for match x in xs {
  X::Foo => { /* ... */ },
  X::Bar => { /* ... */ },
}

This removes the "redundant" braces in the original code without introducing goto fail;-type risk. It's probably a fair amount of work, and it's probably not worth the effort it takes to build, but I don't see any reason why we wouldn't welcome this if the work were already done.

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