src/test/ui/closures/closure-bounds-cant-promote-superkind-in-struct.stderr

   1 error[E0277]: `F` cannot be sent between threads safely
   2   --> $DIR/closure-bounds-cant-promote-superkind-in-struct.rs:5:22
   3    |
   4 LL | struct X<F> where F: FnOnce() + 'static + Send {
   5    |                                           ---- required by this bound in `X`
   6 ...
   7 LL | fn foo<F>(blk: F) -> X<F> where F: FnOnce() + 'static {
   8    |                      ^^^^ `F` cannot be sent between threads safely
   9    |
  10    = help: the trait `std::marker::Send` is not implemented for `F`
  11 help: consider further restricting this bound
  12    |
  13 LL | fn foo<F>(blk: F) -> X<F> where F: FnOnce() + 'static + std::marker::Send {
  14    |                                                       ^^^^^^^^^^^^^^^^^^^
  15
  16 error: aborting due to previous error
  17
  18 For more information about this error, try `rustc --explain E0277`.