1 // revisions: nll_target
3 // The nll_beyond revision is disabled due to missing support from two-phase beyond autorefs
4 //[nll_beyond]compile-flags: -Z two-phase-beyond-autoref
5 //[nll_beyond]should-fail
7 // This is a corner case that the current implementation is (probably)
8 // treating more conservatively than is necessary. But it also does
9 // not seem like a terribly important use case to cover.
11 // So this test is just making a note of the current behavior, with
12 // the caveat that in the future, the rules may be loosened, at which
13 // point this test might be thrown out.
15 // The convention for the listed revisions: "lxl" means lexical
16 // lifetimes (which can be easier to reason about). "nll" means
17 // non-lexical lifetimes. "nll_target" means the initial conservative
18 // two-phase borrows that only applies to autoref-introduced borrows.
19 // "nll_beyond" means the generalization of two-phase borrows to all
20 // `&mut`-borrows (doing so makes it easier to write code for specific
24 let mut vec = vec![0, 1];
25 let delay: &mut Vec<_>;
29 // we reserve here, which could (on its own) be compatible
30 // with the shared borrow. But in the current implementation,
33 //[nll_beyond]~^ ERROR cannot borrow `vec` as mutable because it is also borrowed as immutable
34 //[nll_target]~^^ ERROR cannot borrow `vec` as mutable because it is also borrowed as immutable
39 // the &mut-borrow only becomes active way down here.
41 // (At least in theory; part of the reason this test fails is that
42 // the constructed MIR throws in extra &mut reborrows which
43 // flummoxes our attmpt to delay the activation point here.)