Add comma parsing to func call

compiler/Parser.cs

@@ -467,7 +467,10 @@ public class Parser
                 var parameters = new List<NodeExpression>();
 
                 while (!TryExpectSymbol(Symbol.CloseParen))
+                {
                     parameters.Add(ParseExpression());
+                    TryExpectSymbol(Symbol.Comma);
+                }
 
                 expr = new NodeExpressionFuncCall(TokensFrom(startIndex), expr, parameters);
             }

examples/core/print.nub

@@ -1,7 +1,7 @@
 module core
 
 export func print(text: string) {
-    sys::write(0 text.ptr text.length)
+    sys::write(0, text.ptr, text.length)
 }
 
 export func println(text: string) {