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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/regions/regions-creating-enums.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/regions/regions-creating-enums.rs')
-rw-r--r-- | tests/ui/regions/regions-creating-enums.rs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tests/ui/regions/regions-creating-enums.rs b/tests/ui/regions/regions-creating-enums.rs new file mode 100644 index 000000000..6ed68f803 --- /dev/null +++ b/tests/ui/regions/regions-creating-enums.rs @@ -0,0 +1,33 @@ +enum Ast<'a> { + Num(usize), + Add(&'a Ast<'a>, &'a Ast<'a>) +} + +fn build() { + let x = Ast::Num(3); + let y = Ast::Num(4); + let z = Ast::Add(&x, &y); + compute(&z); +} + +fn compute(x: &Ast) -> usize { + match *x { + Ast::Num(x) => { x } + Ast::Add(x, y) => { compute(x) + compute(y) } + } +} + +fn map_nums<'a,'b, F>(x: &Ast, f: &mut F) -> &'a Ast<'b> where F: FnMut(usize) -> usize { + match *x { + Ast::Num(x) => { + return &Ast::Num((*f)(x)); //~ ERROR cannot return reference to temporary value + } + Ast::Add(x, y) => { + let m_x = map_nums(x, f); + let m_y = map_nums(y, f); + return &Ast::Add(m_x, m_y); //~ ERROR cannot return reference to temporary value + } + } +} + +fn main() {} |