1 error[E0277]: `F` cannot be sent between threads safely
2 --> $DIR/closure-bounds-cant-promote-superkind-in-struct.rs:5:22
4 LL | fn foo<F>(blk: F) -> X<F> where F: FnOnce() + 'static {
5 | ^^^^ `F` cannot be sent between threads safely
7 note: required by a bound in `X`
8 --> $DIR/closure-bounds-cant-promote-superkind-in-struct.rs:1:43
10 LL | struct X<F> where F: FnOnce() + 'static + Send {
11 | ^^^^ required by this bound in `X`
12 help: consider further restricting this bound
14 LL | fn foo<F>(blk: F) -> X<F> where F: FnOnce() + 'static + std::marker::Send {
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0277`.