fix applyOp got ReturnValue

Author: RednibCoding

evaluator.go

@@ -137,6 +137,12 @@ func (e *Evaluator) evaluate(exp *Expr, env *Environment) interface{} {
 	case Binary:
 		a := e.evaluate(exp.Left, env)
 		b := e.evaluate(exp.Right, env)
+		if a_, ok := a.(ReturnValue); ok {
+			a = a_.Value
+		}
+		if b_, ok := b.(ReturnValue); ok {
+			b = b_.Value
+		}
 		result := applyBinaryOp(exp.Operator, a, b, exp)
 		return result
 

example/test.rune

@@ -1,3 +1,18 @@
+fibonacci = fun(n) {
+    if n <= 0 then return = 0
+    elif n == 1 then return = 1
+    else
+    fibonacci(n - 1) + fibonacci(n - 2)
+}
+
+timeBefore = millis()
+result = fibonacci(30)
+timeAfter = millis()
+time = timeAfter - timeBefore
+println("Result: ", result)
+println("Milliseconds: ", time)
+return
+
 factorial = fun(n) {
     if n == 0 then return = 1
     n * factorial(n - 1)