simplify eval, add member function to symtable to call a symbol

src/lib.rs

@@ -26,14 +26,12 @@ mod stl;
 /*mod stl;
 mod str;*/
 
-extern crate lazy_static;
-
 pub mod ast {
     pub use crate::eval::eval;
     pub use crate::lex::lex;
     pub use crate::segment::{Ctr, Seg, Type};
     pub use crate::sym::{
-        SYM_TABLE, SymTable, Symbol,
+        SymTable, Symbol,
         UserFn, ValueType, Args
     };
 }