update macro rewrite functions to return RewriteResult

Author: ding-young

src/expr.rs

@@ -243,13 +243,16 @@ pub(crate) fn format_expr(
         | ast::ExprKind::MethodCall(..)
         | ast::ExprKind::Await(_, _) => rewrite_chain(expr, context, shape).ok(),
         ast::ExprKind::MacCall(ref mac) => {
-            rewrite_macro(mac, None, context, shape, MacroPosition::Expression).or_else(|| {
-                wrap_str(
-                    context.snippet(expr.span).to_owned(),
-                    context.config.max_width(),
-                    shape,
-                )
-            })
+            rewrite_macro(mac, None, context, shape, MacroPosition::Expression)
+                .or_else(|_| {
+                    wrap_str(
+                        context.snippet(expr.span).to_owned(),
+                        context.config.max_width(),
+                        shape,
+                    )
+                    .max_width_error(shape.width, expr.span)
+                })
+                .ok()
         }
         ast::ExprKind::Ret(None) => Some("return".to_owned()),
         ast::ExprKind::Ret(Some(ref expr)) => {

src/items.rs

@@ -3427,7 +3427,7 @@ impl Rewrite for ast::ForeignItem {
                 rewrite_type_alias(ty_alias, context, shape.indent, kind, span)
             }
             ast::ForeignItemKind::MacCall(ref mac) => {
-                rewrite_macro(mac, None, context, shape, MacroPosition::Item)
+                rewrite_macro(mac, None, context, shape, MacroPosition::Item).ok()
             }
         }?;