BASH PATCH REPORT
			     =================

Bash-Release:	5.1
Patch-ID:	bash51-016

Bug-Reported-by:	Vincent Menegaux <vincent.menegaux@gmail.com>
Bug-Reference-ID:
Bug-Reference-URL:	https://savannah.gnu.org/patch/?10070

Bug-Description:

Multiple `!' tokens should toggle negation of an expression in a [[
conditional command, instead of simply negating the expression.

Patch (apply with `patch -p0'):

*** ../bash-20210515/parse.y	2021-04-21 15:32:50.000000000 -0400
--- parse.y	2021-05-24 11:53:30.000000000 -0400
***************
*** 4797,4801 ****
        term = cond_term ();
        if (term)
! 	term->flags |= CMD_INVERT_RETURN;
      }
    else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[1] && yylval.word->word[2] == 0 && test_unop (yylval.word->word))
--- 4797,4801 ----
        term = cond_term ();
        if (term)
! 	term->flags ^= CMD_INVERT_RETURN;
      }
    else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[1] && yylval.word->word[2] == 0 && test_unop (yylval.word->word))

*** ../bash-20210515/y.tab.c	2021-05-14 15:50:41.000000000 -0400
--- y.tab.c	2021-05-24 16:35:55.000000000 -0400
***************
*** 7091,7095 ****
        term = cond_term ();
        if (term)
! 	term->flags |= CMD_INVERT_RETURN;
      }
    else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[1] && yylval.word->word[2] == 0 && test_unop (yylval.word->word))
--- 7091,7095 ----
        term = cond_term ();
        if (term)
! 	term->flags ^= CMD_INVERT_RETURN;
      }
    else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[1] && yylval.word->word[2] == 0 && test_unop (yylval.word->word))

*** ../bash-5.1/patchlevel.h	2020-06-22 14:51:03.000000000 -0400
--- patchlevel.h	2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 15
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 16
  
  #endif /* _PATCHLEVEL_H_ */