X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_passes%2Fsrc%2Flib_features.rs;h=4c6a9b23fdf12a9ed33c99f71337ce81c64364d0;hb=5ff6cdca7ec664c7f96653e6c028b524757d60c4;hp=b5843c0ae488b1f17c58d81c1ae91758baf4e8e7;hpb=e702534763599db252f2ca308739ec340d0933de;p=rust.git

diff --git a/compiler/rustc_passes/src/lib_features.rs b/compiler/rustc_passes/src/lib_features.rs
index b5843c0ae48..4c6a9b23fdf 100644
--- a/compiler/rustc_passes/src/lib_features.rs
+++ b/compiler/rustc_passes/src/lib_features.rs
@@ -137,6 +137,12 @@ fn visit_attribute(&mut self, attr: &'tcx Attribute) {
 }
 
 fn lib_features(tcx: TyCtxt<'_>, (): ()) -> LibFeatures {
+    // If `staged_api` is not enabled then we aren't allowed to define lib
+    // features; there is no point collecting them.
+    if !tcx.features().staged_api {
+        return new_lib_features();
+    }
+
     let mut collector = LibFeatureCollector::new(tcx);
     tcx.hir().walk_attributes(&mut collector);
     collector.lib_features