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lang/rust: mention "2015 edition" rustfmt error fix

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Henrik Lissner 2020-10-04 15:27:29 -04:00
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modules/lang/rust/README.org
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@ -17,6 +17,7 @@
- [[#enable-rls-by-default][Enable RLS by default]]
- [[#enabling-elgot-support-for-rust][Enabling elgot support for Rust]]
- [[#troubleshooting][Troubleshooting]]
- [[#errore0670-async-fn-is-not-permitted-in-the-2015-edition][error[E0670]: `async fn` is not permitted in the 2015 edition]]
* Description
This module adds support for the Rust language and integration for its tools,
@ -100,4 +101,11 @@ selected by default. Modify ~rustic-lsp-server~ to change the default:
Doom's =:tools lsp= module has an =+eglot= flag. Enable it and this module will
use eglot instead.
* TODO Troubleshooting
* Troubleshooting
** error[E0670]: `async fn` is not permitted in the 2015 edition
You may be seeing this error, despite having ~edition = "2018"~ in your
=Cargo.toml=. This error actually originates from ~rustfmt~, which the LSP
server tries to invoke on save (if you have ~rustic-format-on-save~ or =:editor
format= enabled).
To fix this your project needs a =rustfmt.toml= with ~edition = "2018"~ in it.