anchor.diff:  /*
    BSD License
  - 
  +
    Copyright (c) 2021, Tom Everett All rights reserved.
  - 
  +
    Redistribution and use in source and binary forms, with or without modification, are permitted
    provided that the following conditions are met:
  - 
  +
    1. Redistributions of source code must retain the above copyright notice, this list of conditions
    and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the documentation and/or other
    materials provided with the distribution. 3. Neither the name of Tom Everett nor the names of its
    contributors may be used to endorse or promote products derived from this software without specific
    prior written permission.
  - 
  +
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  
positive.code: 
  declaration_statements: declaration_statement+;
  
  declaration_statement: type ID ';';
  
  type: 'int' | 'dfa' | 'nfa' | 'regex' | 'bool' | 'string';
  
  program_block: 'program' '{' statements '}';
  
  
negative.code: 	| variable
  	| STRINGLITERAL
  	| function
  	| type_;
  
  integer: ('+' | '-')? INTEGER;
  
  