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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-20055-box-trait.rs | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-20055-box-trait.rs b/src/test/ui/issues/issue-20055-box-trait.rs new file mode 100644 index 000000000..772cd9d7e --- /dev/null +++ b/src/test/ui/issues/issue-20055-box-trait.rs @@ -0,0 +1,41 @@ +// run-pass +// See Issues #20055 and #21695. + +// We are checking here that the temporaries `Box<[i8, k]>`, for `k` +// in 1, 2, 3, 4, that are induced by the match expression are +// properly handled, in that only *one* will be initialized by +// whichever arm is run, and subsequently dropped at the end of the +// statement surrounding the `match`. + +trait Boo { + fn dummy(&self) { } +} + +impl Boo for [i8; 1] { } +impl Boo for [i8; 2] { } +impl Boo for [i8; 3] { } +impl Boo for [i8; 4] { } + +pub fn foo(box_1: fn () -> Box<[i8; 1]>, + box_2: fn () -> Box<[i8; 2]>, + box_3: fn () -> Box<[i8; 3]>, + box_4: fn () -> Box<[i8; 4]>, + ) { + println!("Hello World 1"); + let _: Box<dyn Boo> = match 3 { + 1 => box_1(), + 2 => box_2(), + 3 => box_3(), + _ => box_4(), + }; + println!("Hello World 2"); +} + +pub fn main() { + fn box_1() -> Box<[i8; 1]> { Box::new( [1; 1] ) } + fn box_2() -> Box<[i8; 2]> { Box::new( [1; 2] ) } + fn box_3() -> Box<[i8; 3]> { Box::new( [1; 3] ) } + fn box_4() -> Box<[i8; 4]> { Box::new( [1; 4] ) } + + foo(box_1, box_2, box_3, box_4); +} |