ast: Reduce size of ExprKind by boxing fields of ExprKind::Struct

Author: petrochenkov

clippy_lints/src/redundant_field_names.rs

@@ -58,8 +58,8 @@ impl EarlyLintPass for RedundantFieldNames {
         if in_external_macro(cx.sess, expr.span) {
             return;
         }
-        if let ExprKind::Struct(_, ref fields, _) = expr.kind {
-            for field in fields {
+        if let ExprKind::Struct(ref se) = expr.kind {
+            for field in &se.fields {
                 if field.is_shorthand {
                     continue;
                 }

clippy_lints/src/suspicious_operation_groupings.rs

@@ -564,7 +564,7 @@ fn ident_difference_expr_with_base_location(
         | (Try(_), Try(_))
         | (Paren(_), Paren(_))
         | (Repeat(_, _), Repeat(_, _))
-        | (Struct(_, _, _), Struct(_, _, _))
+        | (Struct(_), Struct(_))
         | (MacCall(_), MacCall(_))
         | (LlvmInlineAsm(_), LlvmInlineAsm(_))
         | (InlineAsm(_), InlineAsm(_))

clippy_utils/src/ast_utils.rs

@@ -168,8 +168,10 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
         (AddrOf(lbk, lm, le), AddrOf(rbk, rm, re)) => lbk == rbk && lm == rm && eq_expr(le, re),
         (Path(lq, lp), Path(rq, rp)) => both(lq, rq, |l, r| eq_qself(l, r)) && eq_path(lp, rp),
         (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
-        (Struct(lp, lfs, lb), Struct(rp, rfs, rb)) => {
-            eq_path(lp, rp) && eq_struct_rest(lb, rb) && unordered_over(lfs, rfs, |l, r| eq_field(l, r))
+        (Struct(lse), Struct(rse)) => {
+            eq_path(&lse.path, &rse.path) &&
+            eq_struct_rest(&lse.rest, &rse.rest) &&
+            unordered_over(&lse.fields, &rse.fields, |l, r| eq_field(l, r))
         },
         _ => false,
     }