diff --git a/SMILEBASIC/compiler.d b/SMILEBASIC/compiler.d
index 791f30a..dff12ac 100644
--- a/SMILEBASIC/compiler.d
+++ b/SMILEBASIC/compiler.d
@@ -940,9 +940,9 @@ class Compiler
                         }
                     }
                     //TODO:OUT
-                    foreach_reverse(wstring var; func.outVariable)
+                    foreach_reverse(var; func.outVariable)
                     {
-                        genCodePopVar(var, s);
+                        compilePopVar(var, s);
                     }
                 }
                 break;
diff --git a/SMILEBASIC/node.d b/SMILEBASIC/node.d
index 1f98d09..82c3aac 100644
--- a/SMILEBASIC/node.d
+++ b/SMILEBASIC/node.d
@@ -443,7 +443,7 @@ class CallFunctionStatement : Statement
 {
     wstring name;
     Expression[] args;
-    wstring[] outVariable;
+    Expression[] outVariable;
     this(wstring n, SourceLocation loc)
     {
         super.location = loc;
@@ -455,7 +455,7 @@ class CallFunctionStatement : Statement
     {
         args ~= arg;
     }
-    void addOut(wstring var)
+    void addOut(Expression var)
     {
         outVariable ~= var;
     }
diff --git a/SMILEBASIC/parser.d b/SMILEBASIC/parser.d
index 6c6c795..b42600e 100644
--- a/SMILEBASIC/parser.d
+++ b/SMILEBASIC/parser.d
@@ -858,13 +858,13 @@ class Parser
                         while(true)
                         {
                             token = lex.front();
-                            if(token.type != TokenType.Iden)
+                            Expression arg = expression();
+                            if(!isLValue(arg))
                             {
+                                syntaxError();
                                 return null;
                             }
-                            wstring arg = token.value.stringValue;
                             func.addOut(arg);
-                            lex.popFront();
                             token = lex.front();
                             if(token.type == TokenType.Comma)
                             {