VM doesn't support multiple labels

[DartBot]

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

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

main() {
  label1: label2: label3: var x;
}

What is the expected output? What do you see instead?
Expected: successful completion
Actual:
 Error: line 20 pos 11: identifier 'label2' is not declared in this scope
  label1: label2: label3: var x;

What version of the product are you using? On what operating system?
DartVM r5705

Please provide any additional information below.
co19 Language/11_Statements/11_Labels_A01_t03.dart

[DartBot]

This comment was originally written by @mhausner

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Set owner to @mhausner.
Added Area-VM, Accepted labels.

[DartBot]

This comment was originally written by @mhausner

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Very true, the VM only allows one label. I hope we can change the language spec to only allow one label. I'd rather impose complexity on code generators that produce Dart source code than on the Dart compiler backend.

[iposva-google]

Added this to the Later milestone.

[iposva-google]

Removed Priority-Medium label.
Added Priority-Unassigned label.

[ghost]

Also failing:

Language/13_Statements/12_Labels_A01_t03

[DartBot]

This comment was originally written by @mhausner

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Issue #12908 has been merged into this issue.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[kasperl]

Removed Oldschool-Milestone-Later label.

[lrhn]

Added SpecViolation label.

[lrhn]

Removed SpecViolation label.
Added Spec-Violation label.

[iposva-google]

Stale.

[lrhn]

Still not fixed, and spec grammar hasn't changed to not require it.

error: line 2 pos 10: semicolon expected
 foo: bar: for(;;) break;
         ^

[lrhn]

I assume this means that the VM will wait for the Kernel frontend to handle the problem.

[zanderso]

Unless this is critical for 1.5, we think that should be the plan.