Add 'engine/' from commit 'a8e37fc010'

git-subtree-dir: engine
git-subtree-mainline: b74841629e
git-subtree-split: a8e37fc010

engine/modules/gdscript/tests/scripts/runtime/features/recursion.gd

@@ -0,0 +1,19 @@
+func is_prime(number: int, divisor: int = 2) -> bool:
+	print(divisor)
+	if number <= 2:
+		return (number == 2)
+	elif number % divisor == 0:
+		return false
+	elif divisor * divisor > number:
+		return true
+
+	return is_prime(number, divisor + 1)
+
+func test():
+	# Not a prime number.
+	print(is_prime(989))
+
+	print()
+
+	# Largest prime number below 10000.
+	print(is_prime(9973))