BUG about quote removal inside parameter expansion.

[TobiX]

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DSHELL -DHAVE_CONFIG_H  -I.  
-I/home/packages/bash/bash-2.05b -I/home/packages/bash/bash-2.05b/include 
-I/home/packages/bash/bash-2.05b/lib  -g -O2
uname output: Linux ikkoku 2.2.20 #6 Thu Jun 6 20:05:14 CEST 2002 i686 AMD 
Athlon(tm) Processor AuthenticAMD GNU/Linux
Machine Type: i386-pc-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
        This bug is about quote removal inside parameter expansion.
        The one I experienced the bug with is the substitution one:
          ${variable/pattern/string}
          ${variable//pattern/string}
        but AFAIK other parameter expansions could have the same problem.

        1st bug: (documentation bug) It's not clear which quotes or
                 expansions can be performed inside the pattern and the
                 string parts.
        2nd bug: (real bug) If some of them are tried, they generally
                 work, but THE QUOTES AREN'T REMOVED. See the example
                 below.

Repeat-By:
        Try this line:

          hello=world; echo "${hello//r/$'\t'}"
          
        If $'...' quoting were to be performed, the output shuld be:

          wo      ld
          
        Elsewhere, if that quoting were not to be performed, it shuld be:

          wo$'\t'ld
          
        Here is the bug: the substitution is performed, but the quotes
        aren't removed. In fact the true output is this:

          wo'     'ld

        which has no meaning.