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// run-pass
#![allow(unreachable_code)]
#![allow(unused_labels)]
// Test that labels injected by macros do not break hygiene.
// Issue #24278: The label/lifetime shadowing checker from #24162
// conservatively ignores hygiene, and thus issues warnings that are
// both true- and false-positives for this test.
macro_rules! loop_x {
($e: expr) => {
// $e shouldn't be able to interact with this 'x
'x: loop { $e }
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
}
}
macro_rules! run_once {
($e: expr) => {
// ditto
'x: for _ in 0..1 { $e }
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
}
}
macro_rules! while_x {
($e: expr) => {
// ditto
'x: while 1 + 1 == 2 { $e }
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
}
}
pub fn main() {
'x: for _ in 0..1 {
// this 'x should refer to the outer loop, lexically
loop_x!(break 'x);
panic!("break doesn't act hygienically inside for loop");
}
'x: loop {
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
// ditto
loop_x!(break 'x);
panic!("break doesn't act hygienically inside infinite loop");
}
'x: while 1 + 1 == 2 {
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
while_x!(break 'x);
panic!("break doesn't act hygienically inside infinite while loop");
}
'x: for _ in 0..1 {
//~^ WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
//~| WARNING shadows a label name that is already in scope
// ditto
run_once!(continue 'x);
panic!("continue doesn't act hygienically inside for loop");
}
}
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