MixinExtras @Local Annotation cannot receive local varibles in Early Mixin

[kuzuanpa]

Minecraft ver: 1.7.10

I didn't use GTNH's gradle system. And I write a custom CoreMod implementing IFMLLoadingPlugin,IEarlyMixinLoader to achieve same effect.

And mixin class:

@Mixin(FontRenderer.class)

public class MixinUnicodeFontShadow {

    @ModifyConstant(method = "renderStringAtPos", constant = @Constant(floatValue = 1.0F))

    private float TFCMixin$fixShadowDistance(float constant, @Local(ordinal = 1) int j){

        return j==-1?0.5F:1.0F;

    }

}

And Exception:

java.lang.VerifyError: Bad local variable type
Exception Details:
  Location:
    net/minecraft/client/gui/FontRenderer.constant$bge000$TFCMixin$fixShadowDistance$mixinextras$bridge$44(F)F @2: aload_2
  Reason:
    Type top (current frame, locals[2]) is not assignable to reference type
  Current Frame:
    bci: @2
    flags: { }
    locals: { 'net/minecraft/client/gui/FontRenderer', float }
    stack: { 'net/minecraft/client/gui/FontRenderer', float }
  Bytecode:
    0x0000000: 2a23 2cb9 02b1 0100 b702 b3ae

I Guess MixinExtras didn't add the @Local variable when invokeing my method
Correct method invoke should looks like this => TFCMixin$fixShadowDistance$mixinextras...(constant, j);
but it is => TFCMixin$fixShadowDistance$mixinextras...(constant);