Rollup merge of #55510 - bitshifter:repr-feature-gate-fix, r=petrochenkov

Fix feature gate only being checked on first repr attr.

Reported in https://github.com/rust-lang/rust/issues/33158#issuecomment-412185357.

2 files changed, 6 insertions, 1 deletions

diff --git a/src/libsyntax/attr/mod.rs b/src/libsyntax/attr/mod.rs
index 5404420988c..64876659477 100644
--- a/src/libsyntax/attr/mod.rs
+++ b/src/libsyntax/attr/mod.rs
@@ -455,6 +455,11 @@ pub fn find_by_name<'a>(attrs: &'a [Attribute], name: &str) -> Option<&'a Attrib
     attrs.iter().find(|attr| attr.check_name(name))
 }
 
+pub fn filter_by_name<'a>(attrs: &'a [Attribute], name: &'a str)
+    -> impl Iterator<Item = &'a Attribute> {
+    attrs.iter().filter(move |attr| attr.check_name(name))
+}
+
 pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> {
     attrs.iter()
         .find(|at| at.check_name(name))
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index cb15c517c17..55652c481bd 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -1614,7 +1614,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             }
 
             ast::ItemKind::Struct(..) => {
-                if let Some(attr) = attr::find_by_name(&i.attrs[..], "repr") {
+                for attr in attr::filter_by_name(&i.attrs[..], "repr") {
                     for item in attr.meta_item_list().unwrap_or_else(Vec::new) {
                         if item.check_name("simd") {
                             gate_feature_post!(&self, repr_simd, attr.span,