Rollup merge of #78231 - LeSeulArtichaut:closure-target_feature, r=nikomatsakis

Make closures inherit the parent function's target features

r? @ghost
Closes #73631

src/test/ui/rfcs/rfc-2396-target_feature-11/closures-inherit-target_feature.rs

@@ -0,0 +1,18 @@
+// Tests #73631: closures inherit `#[target_feature]` annotations
+
+// check-pass
+// only-x86_64
+
+#![feature(target_feature_11)]
+
+#[target_feature(enable="avx")]
+fn also_use_avx() {
+    println!("Hello from AVX")
+}
+
+#[target_feature(enable="avx")]
+fn use_avx() -> Box<dyn Fn()> {
+    Box::new(|| also_use_avx())
+}
+
+fn main() {}