42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
// run-pass
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// See Issues #20055 and #21695.
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// We are checking here that the temporaries `Box<[i8, k]>`, for `k`
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// in 1, 2, 3, 4, that are induced by the match expression are
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// properly handled, in that only *one* will be initialized by
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// whichever arm is run, and subsequently dropped at the end of the
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// statement surrounding the `match`.
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trait Boo {
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fn dummy(&self) { }
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}
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impl Boo for [i8; 1] { }
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impl Boo for [i8; 2] { }
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impl Boo for [i8; 3] { }
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impl Boo for [i8; 4] { }
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pub fn foo(box_1: fn () -> Box<[i8; 1]>,
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box_2: fn () -> Box<[i8; 2]>,
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box_3: fn () -> Box<[i8; 3]>,
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box_4: fn () -> Box<[i8; 4]>,
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) {
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println!("Hello World 1");
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let _: Box<dyn Boo> = match 3 {
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1 => box_1(),
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2 => box_2(),
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3 => box_3(),
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_ => box_4(),
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};
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println!("Hello World 2");
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}
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pub fn main() {
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fn box_1() -> Box<[i8; 1]> { Box::new( [1; 1] ) }
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fn box_2() -> Box<[i8; 2]> { Box::new( [1; 2] ) }
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fn box_3() -> Box<[i8; 3]> { Box::new( [1; 3] ) }
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fn box_4() -> Box<[i8; 4]> { Box::new( [1; 4] ) }
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foo(box_1, box_2, box_3, box_4);
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}
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