/// Parses a string into Tru abstract syntax that can be Executed.
 public static TruStatement Parse(string code)
 {
     return(TruStatement.Parse(ExprTree.Parse(code)));
 }
 /// Parses and Interprets a string. Environment defaults to the standard library.
 public static TruVal Interpret(string code, Environment env = null)
 {
     env = env ?? TruLibrary.Library;
     return(TruStatement.Parse(code).Interpret(env));
 }