Commits on May 17, 2024

1. Add #[diagnostic::blocking] attribute …

   `#[diagnostic::blocking]` is a marker attribute for functions that are
   considered (by their author) to be a blocking operation, and as such
   shouldn't be invoked from an `async` function. `rustc`, `clippy` and other
   tools can use this signal to lint against calling these functions in `async`
   contexts.
   
   It would allow `rustc`, `clippy` and other tools to provide lints like
   
   ```
   warning: async function `foo` can block
     --> $DIR/blocking-calls-in-async.rs:28:1
      |
   28 | async fn foo() {
      | --------------
   29 |     interesting();
      |     ^^^^^^^^^^^^^`foo` is determined to block because it calls into `interesting`
      |
   note: `interesting` is considered to be blocking because it was explicitly marked as such
     --> $DIR/blocking-calls-in-async.rs:5:1
      |
   5  | #[diagnostic::blocking]
      | ^^^^^^^^^^^^^^^^^^^^^^^
   6  | fn interesting() {}
      | ----------------
   ```

   

   estebank committed May 17, 2024
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