Use Iterator::find instead of open-coding it

Author: LingMan

compiler/rustc_lint/src/types.rs

@@ -680,16 +680,11 @@ pub fn transparent_newtype_field<'a, 'tcx>(
     variant: &'a ty::VariantDef,
 ) -> Option<&'a ty::FieldDef> {
     let param_env = tcx.param_env(variant.def_id);
-    for field in &variant.fields {
+    variant.fields.iter().find(|field| {
         let field_ty = tcx.type_of(field.did);
         let is_zst = tcx.layout_of(param_env.and(field_ty)).map_or(false, |layout| layout.is_zst());
-
-        if !is_zst {
-            return Some(field);
-        }
-    }
-
-    None
+        !is_zst
+    })
 }
 
 /// Is type known to be non-null?