anchor.diff:      // Reset lexer by re-initializing the whole thing
       lexer_init(lexer);
   
  -    if (lexer->cs == lexer_error) {
  +    if (cs == lexer_error) {
         rb_raise(rb_eGherkinLexerError, 0, "Invalid format, parsing fails.");
       } else {
         return Qtrue;
  
positive.code:     assert(*pe == '\0' && "pointer does not end on NULL");
      assert(pe - p == len && "pointers aren't same distance");
      
      %% write exec;
      
      assert(p <= pe && "data overflow after parsing execute");
  
negative.code: #include <assert.h>
  #include <ruby.h>
  
  #if defined(_WIN32)
  #include <stddef.h>
  