@:generic doesn't work with @:structInit

[ALANVF]

Example on try.haxe: https://try.haxe.org/#759D133E

[Simn]

Turns out we don't copy metadata to the generated classes at all, with the exception of @:keep. This probably causes all sorts of weird problems.

If anyone wants to help out: We should go through https://github.com/HaxeFoundation/haxe/blob/development/src-json/meta.json and check if there's any metadata that should not be on the generated class. The only one I can immediately think of is @:generic itself.

[Simn]

I've committed what I meant, using your list of metadata.

[ALANVF]

Fair enough