public override void Visit(FunctionParameter node)
{
var parameterSymbol = (HappyParameterSymbol)node.GetExtension<SymbolExtension>().Symbol;
_expressionStack.Push(node, parameterSymbol.Parameter);
}
public override void Visit(FunctionParameter node)
{
base.Visit(node);
if(this.TopSymbolTable.Items.ContainsKey(node.Name.Text))
_errorCollector.DuplicateFunctionParameterName(node.Name);
else
node.GetExtension<SymbolExtension>().Symbol = this.TopSymbolTable.Add(node.Name.Text);
}