mirror of https://github.com/rust-lang/rust
88 lines
1.9 KiB
Rust
88 lines
1.9 KiB
Rust
//@ check-pass
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// Test `@` patterns combined with `box` patterns.
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#![allow(dropping_references)]
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#![allow(dropping_copy_types)]
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#![feature(box_patterns)]
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#[derive(Copy, Clone)]
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struct C;
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fn c() -> C { C }
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struct NC;
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fn nc() -> NC { NC }
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fn main() {
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let ref a @ box b = Box::new(C); // OK; the type is `Copy`.
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drop(b);
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drop(b);
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drop(a);
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let ref a @ box b = Box::new(c()); // OK; the type is `Copy`.
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drop(b);
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drop(b);
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drop(a);
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fn f3(ref a @ box b: Box<C>) { // OK; the type is `Copy`.
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drop(b);
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drop(b);
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drop(a);
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}
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match Box::new(c()) {
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ref a @ box b => { // OK; the type is `Copy`.
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drop(b);
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drop(b);
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drop(a);
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}
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}
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let ref a @ box ref b = Box::new(NC); // OK.
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drop(a);
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drop(b);
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fn f4(ref a @ box ref b: Box<NC>) { // OK.
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drop(a);
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drop(b)
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}
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match Box::new(nc()) {
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ref a @ box ref b => { // OK.
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drop(a);
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drop(b);
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}
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}
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match Box::new([Ok(c()), Err(nc()), Ok(c())]) {
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box [Ok(a), ref xs @ .., Err(ref b)] => {
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let _: C = a;
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let _: &[Result<C, NC>; 1] = xs;
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let _: &NC = b;
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}
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_ => {}
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}
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match [Ok(Box::new(c())), Err(Box::new(nc())), Ok(Box::new(c())), Ok(Box::new(c()))] {
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[Ok(box a), ref xs @ .., Err(box ref b), Err(box ref c)] => {
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let _: C = a;
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let _: &[Result<Box<C>, Box<NC>>; 1] = xs;
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let _: &NC = b;
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let _: &NC = c;
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}
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_ => {}
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}
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match Box::new([Ok(c()), Err(nc()), Ok(c())]) {
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box [Ok(a), ref xs @ .., Err(b)] => {}
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_ => {}
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}
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match [Ok(Box::new(c())), Err(Box::new(nc())), Ok(Box::new(c())), Ok(Box::new(c()))] {
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[Ok(box ref a), ref xs @ .., Err(box b), Err(box ref mut c)] => {}
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_ => {}
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}
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}
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