From 507f403f952501d9c2c819c5306c0ee4af3183bd Mon Sep 17 00:00:00 2001 From: Guillaume Gomez Date: Sun, 26 Jul 2020 17:38:47 +0200 Subject: [PATCH] Clean up E0733 explanation --- src/librustc_error_codes/error_codes/E0733.md | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/src/librustc_error_codes/error_codes/E0733.md b/src/librustc_error_codes/error_codes/E0733.md index 0bda7a7d682..051b75148e5 100644 --- a/src/librustc_error_codes/error_codes/E0733.md +++ b/src/librustc_error_codes/error_codes/E0733.md @@ -1,4 +1,6 @@ -Recursion in an `async fn` requires boxing. For example, this will not compile: +An [`async`] function used recursion without boxing. + +Erroneous code example: ```edition2018,compile_fail,E0733 async fn foo(n: usize) { @@ -8,8 +10,8 @@ async fn foo(n: usize) { } ``` -To achieve async recursion, the `async fn` needs to be desugared -such that the `Future` is explicit in the return type: +To perform async recursion, the `async fn` needs to be desugared such that the +`Future` is explicit in the return type: ```edition2018,compile_fail,E0720 use std::future::Future; @@ -36,5 +38,7 @@ fn foo_recursive(n: usize) -> Pin>> { } ``` -The `Box<...>` ensures that the result is of known size, -and the pin is required to keep it in the same place in memory. +The `Box<...>` ensures that the result is of known size, and the pin is +required to keep it in the same place in memory. + +[`async`]: https://doc.rust-lang.org/std/keyword.async.html