Re: Mystery: Why does yylineno cause backing up tables?

[John W. Millaway]

(Rephrase of my question.) 
Why are the following three lines in the flex source?

    if ( do_yylineno )
        /* This should really be "maintain_backup_tables = true" */
        reject_really_used = true;

Note: The variable "do_yylineno" is true only if %option yylineno has been
specified. The variable "reject_really_used" is set if you have used REJECT()
in your actions, and causes the big performance penalty by including all the
REJECT handling code in your scanner.


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