mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 15:01:51 +00:00
40ae34194c
detects redundant imports that can be eliminated. for #117772 : In order to facilitate review and modification, split the checking code and removing redundant imports code into two PR.
61 lines
1.0 KiB
Rust
61 lines
1.0 KiB
Rust
// run-pass
|
|
|
|
#![allow(non_snake_case)]
|
|
#![allow(dead_code)]
|
|
#![allow(unused_variables)]
|
|
// Test that the lifetime of rvalues in for loops is extended
|
|
// to the for loop itself.
|
|
static mut FLAGS: u64 = 0;
|
|
|
|
struct Box<T> { f: T }
|
|
struct AddFlags { bits: u64 }
|
|
|
|
fn AddFlags(bits: u64) -> AddFlags {
|
|
AddFlags { bits: bits }
|
|
}
|
|
|
|
fn arg(exp: u64, _x: &AddFlags) {
|
|
check_flags(exp);
|
|
}
|
|
|
|
fn pass<T>(v: T) -> T {
|
|
v
|
|
}
|
|
|
|
fn check_flags(exp: u64) {
|
|
unsafe {
|
|
let x = FLAGS;
|
|
FLAGS = 0;
|
|
println!("flags {}, expected {}", x, exp);
|
|
assert_eq!(x, exp);
|
|
}
|
|
}
|
|
|
|
impl AddFlags {
|
|
fn check_flags(&self, exp: u64) -> &AddFlags {
|
|
check_flags(exp);
|
|
self
|
|
}
|
|
|
|
fn bits(&self) -> u64 {
|
|
self.bits
|
|
}
|
|
}
|
|
|
|
impl Drop for AddFlags {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
FLAGS = FLAGS + self.bits;
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
// The array containing [AddFlags] should not be dropped until
|
|
// after the for loop:
|
|
for x in &[AddFlags(1)] {
|
|
check_flags(0);
|
|
}
|
|
check_flags(1);
|
|
}
|