rustdoc: Don't allow #![feature(...)] on stable or beta

(cherry picked from commit 4057199)
Mark-Simulacrum · Jan 17, 2020 · 076095b · 076095b
1 parent 84eb3b2
commit 076095b
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
@@ -318,8 +318,7 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
         cg: codegen_options,
         externs,
         target_triple: target,
-        // Ensure that rustdoc works even if rustc is feature-staged
-        unstable_features: UnstableFeatures::Allow,
+        unstable_features: UnstableFeatures::from_environment(),
         actually_rustdoc: true,
         debugging_opts: debugging_options,
         error_format,