Hopefully fix doc tests on stable

JelteF · Jul 2, 2023 · 3bfb1fa · 3bfb1fa
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commit 3bfb1fa
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diff --git a/impl/doc/error.md b/impl/doc/error.md
@@ -47,6 +47,7 @@ ignored for one of these methods by using `#[error(not(backtrace))]` or
 If you want to use the `Error` derive on `no_std` environments, then you need to
 compile with nightly and enable this feature:
 ```rust
+# #[cfg(nightly)]
 #![feature(error_in_core)]
 ```