Implement DynSend and DynSync for std::panic::Location.

[zachs18]

Allows the compiler to build with the debug_refcell stdlib cargo feature.

With rust.std-features = ["debug_refcell"] in bootstrap.toml, ./x.py build --stage 2 fails before this patch, and succeeds afterwards.

error for `./x.py build --stage 2` before this patch

error[E0277]: `NonNull<str>` doesn't implement `DynSync`.Add it to `rustc_data_structures::marker` or use `IntoDynSyncSend` if it's already `Sync`
--> compiler/rustc_query_system/src/dep_graph/serialized.rs:719:33
|
719 | let results = broadcast(|_| {
| _______________________---------_^
| | |
| | required by a bound introduced by this call
720 | | let mut local = self.local.borrow_mut();
... |
734 | | });
| |_________^ within `Location<'static>`, the trait `DynSync` is not implemented for `NonNull<str>`
|
note:required because it appears within the type `Location<'static>`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/library/core/src/panic/location.rs:39:12
|
39 | pub struct Location<'a> {
| ^^^^^^^^
= note: required for `&'static Location<'static>` to implement `DynSend`
note: required because it appears within the type `std::option::Option<&'static Location<'static>>`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/library/core/src/option.rs:599:10
|
599 | pub enum Option<T> {
| ^^^^^^
note: required because it appears within the type `std::cell::UnsafeCell<std::option::Option<&'staticLocation<'static>>>`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/library/core/src/cell.rs:2289:12
|
2289 | pub struct UnsafeCell<T: ?Sized> {
| ^^^^^^^^^^
note:required because it appears within the type `Cell<std::option::Option<&'staticLocation<'static>>>`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/library/core/src/cell.rs:313:12
|
313 | pub struct Cell<T: ?Sized> {
| ^^^^
note:required because it appears within the type `RefCell<LocalEncoderState>`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/library/core/src/cell.rs:822:12
|
822 | pub struct RefCell<T: ?Sized> {
| ^^^^^^^
= note: required for `rustc_data_structures::sync::WorkerLocal<RefCell<LocalEncoderState>>` to implement `DynSync`
note: required because it appears within the type `EncoderState<D>`
--> compiler/rustc_query_system/src/dep_graph/serialized.rs:546:8
|
546 | struct EncoderState<D:Deps> {
| ^^^^^^^^^^^^
= note: required because it appears within the type `&EncoderState<D>`
note: required because it's used within this closure
--> compiler/rustc_query_system/src/dep_graph/serialized.rs:719:33
|
719 | let results = broadcast(|_| {
| ^^^
note: required by a bound in `rustc_data_structures::sync::broadcast`
--> /home/zachary/opt_mount/zachary/Programming/rust-compiler-2/compiler/rustc_data_structures/src/sync/parallel.rs:239:56
|
239 | pub fn broadcast<R:DynSend>(op:implFn(usize) -> R + DynSync) -> Vec<R> {
| ^^^^^^^ required by this bound in `broadcast`
For more information about this error, try `rustc --explain E0277`.
error: could not compile `rustc_query_system` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in0:02:04

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[nnethercote]

@bors r+ rollup

[bors]

📌 Commit 6bfb876 has been approved by nnethercote

It is now in the queue for this repository.