fn addExtraAssumeCapacity(astgen: *AstGen, extra: anytype) u32
fn addExtraAssumeCapacity(astgen: *AstGen, extra: anytype) u32 { const field_count = std.meta.fieldNames(@TypeOf(extra)).len; const extra_index: u32 = @intCast(astgen.extra.items.len); astgen.extra.items.len += field_count; setExtra(astgen, extra_index, extra); return extra_index; }