src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-comparing-against-free.stderr

   1 note: no external requirements
   2   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:21:15
   3    |
   4 LL |       foo(cell, |cell_a, cell_x| {
   5    |  _______________^
   6 LL | |         cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
   7 LL | |
   8 LL | |     })
   9    | |_____^
  10    |
  11    = note: defining type: case1::{closure#0} with closure substs [
  12                i32,
  13                for<'r> extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrNamed('r) }) u32>)),
  14                (),
  15            ]
  16
  17 error[E0521]: borrowed data escapes outside of closure
  18   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:22:9
  19    |
  20 LL |     foo(cell, |cell_a, cell_x| {
  21    |                ------  ------ `cell_x` is a reference that is only valid in the closure body
  22    |                |
  23    |                `cell_a` declared here, outside of the closure body
  24 LL |         cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
  25    |         ^^^^^^^^^^^^^^^^^^^^^^^^ `cell_x` escapes the closure body here
  26
  27 note: no external requirements
  28   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:18:1
  29    |
  30 LL | / fn case1() {
  31 LL | |     let a = 0;
  32 LL | |     let cell = Cell::new(&a);
  33 LL | |     foo(cell, |cell_a, cell_x| {
  34 ...  |
  35 LL | |     })
  36 LL | | }
  37    | |_^
  38    |
  39    = note: defining type: case1
  40
  41 note: external requirements
  42   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:35:15
  43    |
  44 LL |       foo(cell, |cell_a, cell_x| {
  45    |  _______________^
  46 LL | |         cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error
  47 LL | |     })
  48    | |_____^
  49    |
  50    = note: defining type: case2::{closure#0} with closure substs [
  51                i32,
  52                for<'r> extern "rust-call" fn((std::cell::Cell<&'_#1r u32>, std::cell::Cell<&ReLateBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrNamed('r) }) u32>)),
  53                (),
  54            ]
  55    = note: number of external vids: 2
  56    = note: where '_#1r: '_#0r
  57
  58 note: no external requirements
  59   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:28:1
  60    |
  61 LL | / fn case2() {
  62 LL | |     let a = 0;
  63 LL | |     let cell = Cell::new(&a);
  64 LL | |
  65 ...  |
  66 LL | |     })
  67 LL | | }
  68    | |_^
  69    |
  70    = note: defining type: case2
  71
  72 error[E0597]: `a` does not live long enough
  73   --> $DIR/propagate-approximated-shorter-to-static-comparing-against-free.rs:30:26
  74    |
  75 LL |       let cell = Cell::new(&a);
  76    |                            ^^ borrowed value does not live long enough
  77 ...
  78 LL | /     foo(cell, |cell_a, cell_x| {
  79 LL | |         cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error
  80 LL | |     })
  81    | |______- argument requires that `a` is borrowed for `'static`
  82 LL |   }
  83    |   - `a` dropped here while still borrowed
  84
  85 error: aborting due to 2 previous errors
  86
  87 Some errors have detailed explanations: E0521, E0597.
  88 For more information about an error, try `rustc --explain E0521`.