mirror of https://github.com/rust-lang/rust
61 lines
1.0 KiB
Rust
61 lines
1.0 KiB
Rust
//@ run-pass
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#![allow(non_snake_case)]
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#![allow(dead_code)]
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#![allow(unused_variables)]
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// Test that the lifetime of rvalues in for loops is extended
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// to the for loop itself.
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static mut FLAGS: u64 = 0;
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struct Box<T> { f: T }
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struct AddFlags { bits: u64 }
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fn AddFlags(bits: u64) -> AddFlags {
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AddFlags { bits: bits }
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}
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fn arg(exp: u64, _x: &AddFlags) {
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check_flags(exp);
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}
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fn pass<T>(v: T) -> T {
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v
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}
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fn check_flags(exp: u64) {
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unsafe {
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let x = FLAGS;
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FLAGS = 0;
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println!("flags {}, expected {}", x, exp);
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assert_eq!(x, exp);
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}
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}
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impl AddFlags {
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fn check_flags(&self, exp: u64) -> &AddFlags {
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check_flags(exp);
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self
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}
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fn bits(&self) -> u64 {
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self.bits
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}
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}
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impl Drop for AddFlags {
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fn drop(&mut self) {
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unsafe {
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FLAGS = FLAGS + self.bits;
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}
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}
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}
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pub fn main() {
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// The array containing [AddFlags] should not be dropped until
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// after the for loop:
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for x in &[AddFlags(1)] {
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check_flags(0);
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}
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check_flags(1);
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}
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