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fn main() {
let foo = Some(0);
let bar = None;
while Some(x) = foo {} //~ ERROR cannot find value `x` in this scope
while Some(foo) = bar {}
while 3 = foo {} //~ ERROR mismatched types
while Some(3) = foo {} //~ ERROR invalid left-hand side of assignment
while x = 5 {} //~ ERROR cannot find value `x` in this scope
}
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