( Diagnostics

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 23 Diagnostics
 The following is a list of `flex' diagnostic messages:
    * `warning, rule cannot be matched' indicates that the given rule
      cannot be matched because it follows other rules that will always
      match the same text as it.  For example, in the following `foo'
      cannot be matched because it comes after an identifier "catch-all"
               [a-z]+    got_identifier();
               foo       got_foo();
      Using `REJECT' in a scanner suppresses this warning.
    * `warning, -s option given but default rule can be matched' means
      that it is possible (perhaps only in a particular start condition)
      that the default rule (match any single character) is the only one
      that will match a particular input.  Since `-s' was given,
      presumably this is not intended.
    * `reject_used_but_not_detected undefined' or
      `yymore_used_but_not_detected undefined'. These errors can occur
      at compile time.  They indicate that the scanner uses `REJECT' or
      `yymore()' but that `flex' failed to notice the fact, meaning that
      `flex' scanned the first two sections looking for occurrences of
      these actions and failed to find any, but somehow you snuck some in
      (via a #include file, for example).  Use `%option reject' or
      `%option yymore' to indicate to `flex' that you really do use
      these features.
    * `flex scanner jammed'. a scanner compiled with `-s' has
      encountered an input string which wasn't matched by any of its
      rules.  This error can also occur due to internal problems.
    * `token too large, exceeds YYLMAX'. your scanner uses `%array' and
      one of its rules matched a string longer than the `YYLMAX'
      constant (8K bytes by default).  You can increase the value by
      #define'ing `YYLMAX' in the definitions section of your `flex'
    * `scanner requires -8 flag to use the character 'x''. Your scanner
      specification includes recognizing the 8-bit character `'x'' and
      you did not specify the -8 flag, and your scanner defaulted to
      7-bit because you used the `-Cf' or `-CF' table compression
      options.  See the discussion of the `-7' flag,  Scanner
      Options, for details.
    * `flex scanner push-back overflow'. you used `unput()' to push back
      so much text that the scanner's buffer could not hold both the
      pushed-back text and the current token in `yytext'.  Ideally the
      scanner should dynamically resize the buffer in this case, but at
      present it does not.
    * `input buffer overflow, can't enlarge buffer because scanner uses
      REJECT'.  the scanner was working on matching an extremely large
      token and needed to expand the input buffer.  This doesn't work
      with scanners that use `REJECT'.
    * `fatal flex scanner internal error--end of buffer missed'. This can
      occur in a scanner which is reentered after a long-jump has jumped
      out (or over) the scanner's activation frame.  Before reentering
      the scanner, use:
               yyrestart( yyin );
      or, as noted above, switch to using the C++ scanner class.
    * `too many start conditions in <> construct!'  you listed more start
      conditions in a <> construct than exist (so you must have listed at
      least one of them twice).
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