83 lines
1.6 KiB
Rust
83 lines
1.6 KiB
Rust
//@ run-pass
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#![allow(unreachable_code)]
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#![allow(unused_labels)]
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// Test that labels injected by macros do not break hygiene. This
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// checks cases where the macros invocations are under the rhs of a
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// let statement.
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// Issue #24278: The label/lifetime shadowing checker from #24162
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// conservatively ignores hygiene, and thus issues warnings that are
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// both true- and false-positives for this test.
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macro_rules! loop_x {
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($e: expr) => {
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// $e shouldn't be able to interact with this 'x
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'x: loop {
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$e
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}
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};
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}
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macro_rules! while_true {
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($e: expr) => {
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// $e shouldn't be able to interact with this 'x
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'x: while 1 + 1 == 2 {
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$e
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}
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};
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}
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macro_rules! run_once {
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($e: expr) => {
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// ditto
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'x: for _ in 0..1 {
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$e
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}
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};
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}
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pub fn main() {
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let mut i = 0;
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let j: isize = {
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'x: loop {
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// this 'x should refer to the outer loop, lexically
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loop_x!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(j, 1);
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let k: isize = {
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'x: for _ in 0..1 {
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// ditto
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loop_x!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(k, 1);
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let l: isize = {
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'x: for _ in 0..1 {
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// ditto
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while_true!(break 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(l, 1);
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let n: isize = {
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'x: for _ in 0..1 {
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// ditto
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run_once!(continue 'x);
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i += 1;
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}
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i + 1
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};
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assert_eq!(n, 1);
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}
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