error message of ${A:?} and ${A?} should be different

[gergely]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux machine 2.6.21-1-686 #1 SMP Sat May 26 16:14:59 UTC 2007 
i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 3.2
Patch Level: 0
Release Status: release

Description:
        risko@bubble:/tmp/x/bash-3.2$ echo ${A?}
        bash: A: parameter null or not set
        risko@bubble:/tmp/x/bash-3.2$ echo ${A:?}
        bash: A: parameter null or not set
        risko@bubble:/tmp/x/bash-3.2$ A=
        risko@bubble:/tmp/x/bash-3.2$ echo ${A:?}
        bash: A: parameter null or not set
        risko@bubble:/tmp/x/bash-3.2$ echo ${A?}
        <no error message>

        I don't like the first error message.  It should say something like
        "bash: A: parameter not set", because I have omitted the colon.

Repeat-By:
        See description.

Fix:
--- subst.c.orig        2007-10-02 00:28:55.000000000 +0200
+++ subst.c     2007-10-02 00:30:55.000000000 +0200
@@ -267,7 +267,7 @@
 static WORD_DESC *parameter_brace_expand_word __P((char *, int, int));
 static WORD_DESC *parameter_brace_expand_indir __P((char *, int, int, int *, 
int *));
 static WORD_DESC *parameter_brace_expand_rhs __P((char *, char *, int, int, 
int *, int *));
-static void parameter_brace_expand_error __P((char *, char *));
+static void parameter_brace_expand_error __P((char *, char *, int));

 static int valid_length_expression __P((char *));
 static intmax_t parameter_brace_expand_length __P((char *));
@@ -5050,8 +5050,9 @@
    used as the error message to print, otherwise a standard message is
    printed. */
 static void
-parameter_brace_expand_error (name, value)
+parameter_brace_expand_error (name, value, check_nullness)
      char *name, *value;
+     int check_nullness;
 {
   WORD_LIST *l;
   char *temp;
@@ -5065,7 +5066,12 @@
       dispose_words (l);
     }
   else
-    report_error (_("%s: parameter null or not set"), name);
+    {
+      if (check_nullness)
+        report_error (_("%s: parameter null or not set"), name);
+      else
+        report_error (_("%s: parameter not set"), name);
+    }

   /* Free the data we have allocated during this expansion, since we
      are about to longjmp out. */
@@ -6259,7 +6265,7 @@
            }
          else if (c == '?')
            {
-             parameter_brace_expand_error (name, value);
+             parameter_brace_expand_error (name, value, check_nullness);
              return (interactive_shell ? &expand_wdesc_error : 
&expand_wdesc_fatal);
            }
          else if (c != '+')