No completion when typing break after case with pattern matching

[KirillOsenkov]

Version Used:
VS 2017 Update 2

Steps to Reproduce:

In a C# file, paste this code:

class C
{
    void M()
    {
        switch (foo)
        {
            case Bar bar:
                $$
            default: break;
        }
    }
}

Type break where the $$ is.

Expected Behavior:
Completion offering "break".

Actual Behavior:
No completion.

[CyrusNajmabadi]

Dupe of #15348