src/test/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr

   1 error[E0277]: expected a `std::ops::Fn<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
   2   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:13
   3    |
   4 LL |     let x = call_it(&square, 22);
   5    |             ^^^^^^^ expected an `Fn<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
   6    |
   7    = help: the trait `for<'r> std::ops::Fn<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
   8 note: required by `call_it`
   9   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:7:1
  10    |
  11 LL | fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 }
  12    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  13
  14 error[E0277]: expected a `std::ops::FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  15   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:13
  16    |
  17 LL |     let x = call_it(&square, 22);
  18    |             ^^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  19    |
  20    = help: the trait `std::ops::FnOnce<(&isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
  21 note: required by `call_it`
  22   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:7:1
  23    |
  24 LL | fn call_it<F:Fn(&isize)->isize>(_: &F, _: isize) -> isize { 0 }
  25    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  26
  27 error[E0277]: expected a `std::ops::FnMut<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  28   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:18:13
  29    |
  30 LL |     let y = call_it_mut(&mut square, 22);
  31    |             ^^^^^^^^^^^ expected an `FnMut<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  32    |
  33    = help: the trait `for<'r> std::ops::FnMut<(&'r isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
  34 note: required by `call_it_mut`
  35   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:8:1
  36    |
  37 LL | fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 }
  38    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  39
  40 error[E0277]: expected a `std::ops::FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  41   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:18:13
  42    |
  43 LL |     let y = call_it_mut(&mut square, 22);
  44    |             ^^^^^^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  45    |
  46    = help: the trait `std::ops::FnOnce<(&isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
  47 note: required by `call_it_mut`
  48   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:8:1
  49    |
  50 LL | fn call_it_mut<F:FnMut(&isize)->isize>(_: &mut F, _: isize) -> isize { 0 }
  51    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  52
  53 error[E0277]: expected a `std::ops::FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  54   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:24:13
  55    |
  56 LL |     let z = call_it_once(square, 22);
  57    |             ^^^^^^^^^^^^ expected an `FnOnce<(&isize,)>` closure, found `for<'r> unsafe fn(&'r isize) -> isize {square}`
  58    |
  59    = help: the trait `std::ops::FnOnce<(&isize,)>` is not implemented for `for<'r> unsafe fn(&'r isize) -> isize {square}`
  60 note: required by `call_it_once`
  61   --> $DIR/unboxed-closures-unsafe-extern-fn.rs:9:1
  62    |
  63 LL | fn call_it_once<F:FnOnce(&isize)->isize>(_: F, _: isize) -> isize { 0 }
  64    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  65
  66 error: aborting due to 5 previous errors
  67
  68 For more information about this error, try `rustc --explain E0277`.