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

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

Bug-Reported-by:        Vincent Menegaux <[email protected]>
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_ */