mirror of https://github.com/rust-lang/rust
62 lines
1.1 KiB
Rust
62 lines
1.1 KiB
Rust
fn borrow(_v: &isize) {}
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fn local() {
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let mut v: Box<_> = Box::new(3);
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borrow(&*v);
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}
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fn local_rec() {
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struct F { f: Box<isize> }
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let mut v = F {f: Box::new(3)};
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borrow(&*v.f);
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}
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fn local_recs() {
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struct F { f: G }
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struct G { g: H }
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struct H { h: Box<isize> }
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let mut v = F {f: G {g: H {h: Box::new(3)}}};
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borrow(&*v.f.g.h);
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}
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fn aliased_imm() {
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let mut v: Box<_> = Box::new(3);
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let w = &v;
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borrow(&*v);
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w.use_ref();
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}
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fn aliased_mut() {
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let mut v: Box<_> = Box::new(3);
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let w = &mut v;
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borrow(&*v); //~ ERROR cannot borrow `*v`
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w.use_mut();
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}
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fn aliased_other() {
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let mut v: Box<_> = Box::new(3);
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let mut w: Box<_> = Box::new(4);
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let x = &mut w;
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borrow(&*v);
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x.use_mut();
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}
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fn aliased_other_reassign() {
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let mut v: Box<_> = Box::new(3);
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let mut w: Box<_> = Box::new(4);
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let mut x = &mut w;
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x = &mut v;
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borrow(&*v); //~ ERROR cannot borrow `*v`
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x.use_mut();
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}
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fn main() {
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}
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trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } }
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impl<T> Fake for T { }
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