ExprReversedList Fix (#8171)

* Initial Commit

* Update 8170-reversed-single.sk

Author: Absolutionism

src/main/java/ch/njol/skript/expressions/ExprReversedList.java

@@ -9,13 +9,13 @@
 import ch.njol.skript.lang.ExpressionType;
 import ch.njol.skript.lang.Literal;
 import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.skript.lang.simplification.SimplifiedLiteral;
 import ch.njol.skript.lang.util.SimpleExpression;
 import ch.njol.skript.util.LiteralUtils;
 import ch.njol.util.Kleenean;
 import ch.njol.util.coll.CollectionUtils;
 import org.bukkit.event.Event;
 import org.jetbrains.annotations.Nullable;
-import ch.njol.skript.lang.simplification.SimplifiedLiteral;
 
 import java.lang.reflect.Array;
 
@@ -43,6 +43,10 @@ public ExprReversedList(Expression<?> list) {
 	@Override
 	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
 		list = LiteralUtils.defendExpression(exprs[0]);
+		if (list.isSingle()) {
+			Skript.error("A single object cannot be reversed.");
+			return false;
+		}
 		return LiteralUtils.canInitSafely(list);
 	}
 

src/test/skript/tests/regressions/8170-reversed-single.sk

@@ -0,0 +1,16 @@
+test "reversed single":
+	parse:
+		loop reversed 5:
+			broadcast "filler"
+	assert last parse logs contains "A single object cannot be reversed." with "Parse error was not thrown"
+
+	set {_num} to 5
+	parse:
+		loop reversed {_num}:
+			broadcast "filler"
+	assert last parse logs contains "A single object cannot be reversed." with "Parse error was not thrown"
+
+test "reversed literal times":
+	loop reversed 5 times:
+		add loop-value to {_reversed::*}
+	assert {_reversed::*} is (5, 4, 3, 2, and 1) with "reversed literal times did not parse correctly"