frog doesn't report error/warning if returning value from void function

[DartBot]

This issue was originally filed by mattsh@google.com

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void foo() {
  return 6;
}

gives no errors or warnings in frog.

[DartBot]

This comment was originally written by drfibonacci@google.com

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Added Area-Frog, Triaged labels.

[jmesserly]

This appears to be fixed (at least, if "foo" is called):

/Users/jmesserly/scratch/test.dart:2:10: warning: type "int" is not assignable to "void"
  return 6;

I suspect this bug predates our checking of return types.

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Added Fixed label.

[DartBot]

This comment was originally written by mattsh@google.com

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Yes, works great now.

[DartBot]

This comment was originally written by mattsh@google.com

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Added Verified label.