added changing criterion to scoreboard_add #624

src/main/java/carpet/mixins/ScoreboardObjective_scarpetMixin.java

@@ -0,0 +1,12 @@
+package carpet.mixins;
+
+import net.minecraft.scoreboard.ScoreboardCriterion;
+import net.minecraft.scoreboard.ScoreboardObjective;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(ScoreboardObjective.class)
+public interface ScoreboardObjective_scarpetMixin {
+    @Accessor("criterion")
+    void setCriterion(ScoreboardCriterion criterion);
+}

src/main/java/carpet/mixins/Scoreboard_scarpetMixin.java

@@ -0,0 +1,16 @@
+package carpet.mixins;
+
+import net.minecraft.scoreboard.Scoreboard;
+import net.minecraft.scoreboard.ScoreboardCriterion;
+import net.minecraft.scoreboard.ScoreboardObjective;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import java.util.List;
+import java.util.Map;
+
+@Mixin(Scoreboard.class)
+public interface Scoreboard_scarpetMixin {
+    @Accessor("objectivesByCriterion")
+    Map<ScoreboardCriterion, List<ScoreboardObjective>> getObjectivesByCriterion();
+}