DartVM: interface must declare a factory class

[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 {
  I();
}

class A implements I {}

main() {
  new A();
}

What is the expected output? What do you see instead?
Expected: compile-time error ("It is a compile-time error if an interface declares a constructor without declaring a factory class"
Actual: the code is successfully compiled

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/A02/t07

[dgrove]

Added Area-VM, Triaged labels.

[iposva-google]

Marked this as being blocked by #1031.

[iposva-google]

Matthias, can you please work with Gilad to resolve whether these are still expected to be compile-time errors and whether they should be. See the blocking bug.

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cc @gbracha.
Set owner to @mhausner.
Added Accepted label.

[gbracha]

We do not have any plan to relax this rule. It should result in a compilation error.

[DartBot]

This comment was originally written by @mhausner

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Fixed as of r6046

[DartBot]

This comment was originally written by @mhausner

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Fixed as of r6046.

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Added Fixed label.