Cannot Inject into Lambda's

[hYdos]

Mixin expects only public methods but it also wants all static methods to be private in a Mixin. Below is an example of how you can run into this issue.
Example Mixin:

@Mixin(RegistryAccess.class)
public interface RegistryAccessMixin {

    @Inject(method = "method_30531", at = @At("RETURN"), cancellable = true, locals = LocalCapture.PRINT)
    private static void hookBuiltinRegistriesEvent(@NotNull CallbackInfoReturnable<Map<ResourceKey<? extends Registry<?>>, RegistryAccess.RegistryData<?>>> cir) {
        //cir.setReturnValue(net.minecraftforge.experimental.registries.DataPackRegistriesHooks.addBuiltinRegistriesEvent(cir.getReturnValue()));
    }
}

This Mixin tries to inject into a lambda inside of the interface RegistryAccess. The bytecode of the class states that the method is public static synthetic method_30531()Lcom/google/common/collect/ImmutableMap; meaning that it requires the @Inject method to be static and private. The issue with this is that mixin will give Interface mixin contains a non-public method!. Setting the method to public will then make Mixin say Mixin dynamicRegistries.mixins.json:RegistryAccessMixin contains non-private static method

[LlamaLad7]

You can't inject in interfaces on stock mixin. This should probably be an issue on Fabric's fork.

[hYdos]

This issue was ran into on a forge environment but thanks, Ill move the issue there.

[hYdos]

Forge doesnt seem to have a mixin fork. Are you sure vanilla mixin cant inject interfaces?

You can't inject in interfaces on stock mixin. This should probably be an issue on Fabric's fork.

[LlamaLad7]

Are you in an architectury environment? You seem to be using yarn

[hYdos]

Are you in an architectury environment? You seem to be using yarn

Yep

[Earthcomputer]

Are you sure vanilla mixin cant inject interfaces?

Yes

[LlamaLad7]

IIRC Architectury uses Fabric Mixin in dev even on Forge. Should be clear from the console output.

[hYdos]

IIRC Architectury uses Fabric Mixin in dev even on Forge. Should be clear from the console output.

Oh alright my bad.

[hYdos]

This is actually an issue with Sponge Mixin. See #497