Partial Generics for Collection Literals

[TonyValenti]

Today I have to write code like this:

                    List<(int, string, bool, string)> Table = [
                        (1, "aoeu", true, "aoeu"),
                        (1, "aoeu", true, "aoeu"),
                        (1, "aoeu", true, "aoeu"),
                    ];

This sucks because if I want to add or reorder columns in my table, I also have to do that in the List<(???)> definition.

It would be so much nicer if I could do this:

                    List<> Table = [
                        (1, "aoeu", true, "aoeu"),
                        (1, "aoeu", true, "aoeu"),
                        (1, "aoeu", true, "aoeu"),
                    ];

[HaloFour]

Would this shake out of natural types for collection literals?

[CyrusNajmabadi]

yes. but it wouldn't work if you did ImmutableArray<> table = [ ... ]. We'd need a new system for that. Fortunately, that is something being looked into.

[HaloFour]

Part of supporting natural types would be to support extension methods off of the collection literal, too, right? In that you could write an extension method to support:

var array = [ ... ].ToImmutableArray();

For partial type inference: #1349

[KennethHoff]

Are extension method being looked at in conjunction with natural type? I realize that they are both being looked at, but they feel somewhat unrelated.

[CyrusNajmabadi]

Both are in the bucket of things we're looking at in this space :)