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Discussion: I honestly have no idea what this test is actually trying to exercise. This goes all the way back to 2010 d6b7c96.

I assume this is trying to exercise some short-circuiting behavior of || and && but the test itself makes it hard to tell.

EDIT: the OG version of this Rust was

fn incr(mutable &int x) -> bool { x += 1; check (false); ret false; }

fn main() {

auto x = (1 == 2) || (3 == 3); check (x);

let int y = 10; log x || incr(y); check (y == 10);

if (true && x) { check (true); } else { check (false); }

}

so yeah, I believe this is indeed a || and && short-circuiting test. It has a no-arg closure, presumably because back then there must've been a case where the parser confused || and the no-arg closure form || EXPR or sth.