Function literals not permitted inside string interpolation inside initializers

[stereotype441]

Both the vm and dart2js reject the following code, which is allowed by the spec:

class C {
  String s;
  C(x) : s = "2x is ${() { return 2x; }()}"; // error
}

The problem only occurs inside initializers, so for example this works just fine:

String s = "2x is ${() { return 2x; }()}"; // ok

See also issue #11509.

Note: both the vm and dart2js have explicit logic to permit function literals inside parenthesized expressions, list literals, map literals, and function arguments. I suspect it was an oversight not to apply similar logic to string interpolation.

[lrhn]

Filing as dart2js, copy for the VM as issue #18112

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Added Area-Dart2JS, Triaged labels.

[floitschG]

Set owner to @floitschG.
Added Started label.

[floitschG]

Fixed in r34919.

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Added Fixed label.