Fixes can't rock with pronouns

Fixes #359

* Evaluate all elements (e.g. pronouns) first, BEFORE allocating/assigning the array - because allocation/assignment updates the pronoun subject so `it` points to the array after it's done, and if one of the elements is a pronoun, this will create an infinite loop. Eval()ing all the elements first fixes this.

Starship/Rockstar.Engine/RockstarEnvironment.cs

@@ -247,16 +247,14 @@ private Result Dequeue(Dequeue dequeue) {
 
 	private Result Enlist(Enlist e) {
 		var scope = e.Expressions.Any() ? Scope.Global : Scope.Local;
-		var value = Lookup(e.Variable, scope);
-		if (value is Strïng s) {
-			foreach (var expr in e.Expressions) s.Append(Eval(expr));
-			return new(s);
-		}
-		if (value is not Arräy array) {
-			array = value == Mysterious.Instance ? new Arräy() : new(value);
+		var target = Lookup(e.Variable, scope);
+		var values = e.Expressions.Select(Eval).ToArray();
+		if (target is Strïng s) return new(s.Append(values));
+		if (target is not Arräy array) {
+			array = target == Mysterious.Instance ? new Arräy() : new(target);
 			SetVariable(e.Variable, array, Scope.Local);
 		}
-		foreach (var expr in e.Expressions) array.Push(Eval(expr));
+		foreach (var value in values) array.Push(value);
 		return new(array);
 	}
 

Starship/Rockstar.Engine/Values/Strïng.cs

@@ -128,6 +128,11 @@ public Value ToCharCodes() {
 		};
 	}
 
+	public Value Append(params Value[] values) {
+		foreach (var value in values) this.Append(value);
+		return this;
+	}
+
 	public Value Append(Value v) {
 		if (v is Numbër number) {
 			this.Value += (char) number.IntegerValue;

Starship/Rockstar.Test/programs/fixtures/arrays/various-array-tests.rock

@@ -2,4 +2,10 @@ for x in 3
 n=0
 r at i=0
 
-print r (prints: [ 0 ])
+print r (prints: [ 0 ])
+
+
+foo is 1
+shout it (prints: 1)
+rock bar with it
+shout bar (prints: [ 1 ])