Please support yield collection from IEnumerable

[Thaina]

In addition to yield return from IEnumerable function. C# should be able to yield any other IEnumerable from inside

IEnumerable<int> GetInt()
{
    yield return 0;
    yield return 1;
    yield return 2;
    yield [3,4,5];
    yield return 6;
    yield return 7;
    yield return 8;
    yield Enumerable.Range(9,99);
}

Like yield* in js

[dsaf]

F# has this, it enables proper recursion as well: http://theburningmonk.com/2011/09/fsharp-yield-vs-yield

[alrz]

#15

[gafter]

Language design discussion now takes place at https://github.com/dotnet/csharplang . Please reopen there if you want to continue this. I am closing this as the discussion appears to be stale. See also dotnet/csharplang#378