Using MAT_SNACK_BAR_DEFAULT_OPTIONS in parent module don't show snackbar at all

[kgrvr]

Bug, feature request, or proposal:

BUG

What is the expected behavior?

Snackbar should be displayed.

What is the current behavior?

Snackbar is not displaying.

What are the steps to reproduce?

Please have a look at StackBlitz: https://stackblitz.com/edit/angular-zihwqu?file=app%2Fsnack-bar-overview-example.ts

1. Don't provide any Snackbar options when invoking open method.
2. Provide Snackbar options in parent module.
3. Try opening Snackbar.

What is the use-case or motivation for changing an existing behavior?

Bug fix

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular CLI: 6.0.0
Node: 8.9.0
OS: win32 x64
Angular: 6.0.0

Is there anything else we should know?

I don't think so

[Boboss74]

In the official https://material.angular.io/components/snack-bar/examples it display nothing too
(v6.0.1)

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