50 lines
965 B
Rust
50 lines
965 B
Rust
// run-pass
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#![allow(unused_must_use)]
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#![allow(dead_code)]
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use std::thread;
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fn user(_i: isize) {}
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fn foo() {
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// Here, i is *copied* into the proc (heap closure).
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// Requires allocation. The proc's copy is not mutable.
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let mut i = 0;
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let t = thread::spawn(move|| {
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user(i);
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println!("spawned {}", i)
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});
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i += 1;
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println!("original {}", i);
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t.join();
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}
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fn bar() {
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// Here, the original i has not been moved, only copied, so is still
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// mutable outside of the proc.
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let mut i = 0;
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while i < 10 {
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let t = thread::spawn(move|| {
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user(i);
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});
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i += 1;
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t.join();
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}
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}
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fn car() {
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// Here, i must be shadowed in the proc to be mutable.
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let mut i = 0;
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while i < 10 {
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let t = thread::spawn(move|| {
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let mut i = i;
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i += 1;
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user(i);
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});
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i += 1;
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t.join();
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}
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}
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pub fn main() {}
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