add warning for dynamic slot attribute

Author: yyx990803

src/compiler/resolve-slots.js

@@ -1,7 +1,9 @@
 import { parseTemplate } from '../parsers/template'
 import {
   isTemplate,
-  toArray
+  toArray,
+  getBindAttr,
+  warn
 } from '../util/index'
 
 /**
@@ -28,6 +30,9 @@ export function resolveSlots (vm, content) {
       (contents[name] || (contents[name] = [])).push(el)
     }
     /* eslint-enable no-cond-assign */
+    if (process.env.NODE_ENV !== 'production' && getBindAttr(el, 'slot')) {
+      warn('The "slot" attribute must be static.')
+    }
   }
   for (name in contents) {
     contents[name] = extractFragment(contents[name], content)

test/unit/specs/directives/element/slot_spec.js

@@ -444,4 +444,17 @@ describe('Slot Distribution', function () {
     })
     expect(vm.$el.textContent).toBe('hi')
   })
+
+  it('warn dynamic slot attribute', function () {
+    new Vue({
+      el: el,
+      template: '<test><div :slot="1"></div></test>',
+      components: {
+        test: {
+          template: '<div><slot></slot></div>'
+        }
+      }
+    })
+    expect('"slot" attribute must be static').toHaveBeenWarned()
+  })
 })