From 64d98f8ee037282c35007b64c2649055c56af1db Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:03 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/ui/regions/regions-creating-enums.rs | 33 ++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 tests/ui/regions/regions-creating-enums.rs (limited to 'tests/ui/regions/regions-creating-enums.rs') 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() {} -- cgit v1.2.3