Description of problem:
 
  There is a problem with bash/sh scripts that use subshells. Two
sample shell scripts below, both with nested subshells, the first
works and the second doesn't. The difference is that the logical 'and'
(&&) is on the end of line one in the first but on the beginning of
line two in the second (which fails). There is no whitespace after the
'\' delimiter.

Version-Release number of selected component (if applicable):

The above scripts are tested under RHEL 3 U3 Bash Version:
2.05b.0(1)-release (i386-redhat-linux-gnu)


How reproducible:

script which works:

$ cat /tmp/test1

((echo line1) && \
(echo line2))

$ sh /tmp/test1
line1
line2


script which fails:

$ cat /tmp/test2
((echo line1) \
&& (echo line2))

$ sh /tmp/test2
/tmp/test2: line 2: syntax error near unexpected token `'
/tmp/test2: line 2: `&& (echo line2))'

  
Actual results:


Expected results:
 The /tmp/test2 should work

Additional info:

 I have tested with different version of bash, the script works only
in bash version 1.14.7(1) on Linux.

Below is the various errors thrown by different version of bash under
Linux,

1.  bash-1.14.7 - Works fine

2.  bash-2.0

/tmp/test1: line 1: missing closing `)' for arithmetic expression
/tmp/test1: line 1: syntax error near unexpected token `&'
/tmp/test1: line 1: `((echo line1) && \'

/tmp/test2: line 1: missing closing `)' for arithmetic expression
/tmp/test2: line 1: syntax error near unexpected token `\'
/tmp/test2: line 1: `((echo line1) \'

3.  bash-2.01,   bash-2.01.1,    bash-2.02,    bash-2.02.1,  
bash-2.03,   bash-2.04,   bash-2.05,   bash-2.05a

/tmp/test2: line 2: syntax error near unexpected token `&'
/tmp/test2: line 2: `&& (echo line2))'


4.  bash-2.05b (under RHEL 3 U3),  bash-3.0

/tmp/test2: line 2: syntax error near unexpected token `'
/tmp/test2: line 2: `&& (echo line2))'


My observations in this problem are

1. Only bash version 1.14.7 is able to execute the script
2. Starting from bash-2.0 through bash-2.05a, the error message is
same <  syntax error near unexpected token `&'  >
3. In bash-2.05b and bash-3.0 the error message does not include the
'&' symbol < syntax error near unexpected token `' >