Completions for struct fields that are containers

[llogick]

Taking/Posting screenshots for this one would be impractical, so here's some code to give an idea what's covered:

const MyEnum = enum {
    ef1,
    ef2,
};
const oes = struct {
    const es = if (true) S1 else S2;
};
const es = switch (1) {
    1 => S1,
    2 => S2,
    3 => S3,
};
const S1 = struct { s1f1: u8, s1f2: u32 = 1, ref3: S3 = undefined };
const S2 = struct { s2f1: u8, s2f2: u32 = 1, ref1: S1, mye: MyEnum = .ef1};
const S3 = struct {
    s3f1: u8,
    s3f2: u32 = 1,
    ref2: S2,
    pub fn s3(p0: es, p1: S2) void {
        _ = p0;
        _ = p1;
    }
};
test {
    const refs = S3{ .ref2 = .{ .ref1 = .{ .ref3 = .{ .ref2 = .{ .ref1 = .{} } } } } };
    _ = refs;
    const esi: es = .{};
    _ = esi;
    const oesi: oes.es = .{ .mye = .{} };
    _ = oesi;
    S3.s3(.{.mye = .{}}, .{.ref1 = .{.ref3 = .{.ref2 = .{.ref1 = .{}}}}});
}