DartVM crash: empty factory name

[DartBot]

This issue was originally filed by ief...@unipro.ru

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What steps will reproduce the problem?
consider the following test:

interface I default {
  I();
}

main() {}

What is the expected output? What do you see instead?
Expected: compile-time error
Actual: runtime/vm/parser.cc:1908: error: expected: CurrentToken() == Token::kIDENT

What version of the product are you using? On what operating system?
DartVM r2810

Please provide any additional information below.
co19 test:
LangSpecTest/08_Interfaces/3/Factories/and/Constructors/A01/t01

[dgrove]

Added Area-VM, Triaged labels.

[DartBot]

This comment was originally written by @mhausner

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Set owner to @mhausner.

[DartBot]

This comment was originally written by @mhausner

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Fixed in CL 2930

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Added Fixed label.