Call functions

tests/fib.grnd

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+set &a 0
+set &b 1
+set &n 92
+
+set &i 0
+@loop
+    equal $i $n &done
+    if $done %end
+    
+    add $a $b &temp
+    set &a $b
+    set &b $temp
+    
+    add $i 1 &i
+    jump %loop
+
+@end
+println "Fibonacci result:" $a
+end