feedback

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js

@@ -146,9 +146,7 @@ export function build_component(node, component_name, context, anchor = context.
 					return (
 						n.type === 'ExpressionTag' &&
 						n.expression.type !== 'Identifier' &&
-						n.expression.type !== 'MemberExpression' &&
-						n.expression.type !== 'UpdateExpression' &&
-						n.expression.type !== 'AssignmentExpression'
+						n.expression.type !== 'MemberExpression'
 					);
 				});
 

packages/svelte/src/internal/client/dom/elements/events.js

@@ -314,7 +314,7 @@ export function apply(
 
 	if (typeof handler === 'function') {
 		handler.apply(element, args);
-	} else if (has_side_effects || handler != null) {
+	} else if (has_side_effects || handler != null || error) {
 		const filename = component?.[FILENAME];
 		const location = loc ? ` at ${filename}:${loc[0]}:${loc[1]}` : ` in ${filename}`;