private BoundExpression BindIdentifierExpression(IdentifierExpression expression) { string name = expression.IdentifierToken.Text; if (symbolTable.TryGetValue(expression.IdentifierToken.Text, out var value)) { return(new BoundIdentifierExpression(name, value.GetType(), value)); } diagnostics.Report(expression.IdentifierToken.Span, "Variable not defined"); return(new BoundIdentifierExpression(name, typeof(int), 0)); }