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Masaki Hara (qnighy@qnmd.info)'s status on Thursday, 28-Feb-2019 10:16:31 JST Masaki Hara

https://github.com/rust-lang/rust/pull/58678
Rust2015モードでasync fnを禁止するプルリクが通った。Rust2015モードはasync/awaitがキーワードではないなど、async fnの機能を提供するには条件が不十分なため。async fnは今は不安定機能なので互換性を保つ必要はないし、むしろRust2018に移行するインセンティブになる
In conversation Thursday, 28-Feb-2019 10:16:31 JST from qnmd.info permalink
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1. Deny `async fn` in 2015 edition by doctorn · Pull Request #58678 · rust-lang/rust
  
  from GitHub
  
  This commit prevents code using async fn from being compiled in Rust 2015 edition. Compiling code of the form: async fn foo() {} Will now result in the error: error[E0670]: `async fn` is not permit...

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