fix(compiler): Remove the waring for valid v-slot value

Author: liximomo

src/compiler/error-detector.js

@@ -31,6 +31,7 @@ function checkNode (node: ASTNode, warn: Function) {
   if (node.type === 1) {
     for (const name in node.attrsMap) {
       if (dirRE.test(name)) {
+        if (name === 'v-slot') break;
         const value = node.attrsMap[name]
         if (value) {
           const range = node.rawAttrsMap[name]

test/unit/features/component/component-scoped-slot.spec.js

@@ -759,6 +759,14 @@ describe('Component scoped slot', () => {
         }).$mount()
         expect(`Unexpected mixed usage of different slot syntaxes`).toHaveBeenWarned()
       })
+
+      it('should allow destructuring props with default value', () => {
+        new Vue({
+          template: `<foo ${syntax}="{ foo = { bar: '1' } }"></foo>`,
+          components: { Foo, Bar }
+        }).$mount();
+        expect('Invalid shorthand property initializer').not.toHaveBeenWarned()
+      })
     }
 
     // run tests for both full syntax and shorthand