{1}rem comment=1
rem 'echo' is word=2, 'a' is default=0
{2}echo{0} a
{1}rem label=3
{3}:START
{1}rem '@' is hide=4
{4}@{2}echo{0} b
{1}rem 'gcc' is external command=5
{5}gcc{0} --version
{1}rem '%PATH%' is variable=6
{2}echo{0} {6}%PATH%{0}
{2}echo{0} {6}%ProgramFiles(x86)%{0}
{1}rem operator=7 '='
{4}@{2}set{0} Q{7}={0}A

{1}::comment=1
{0}
{1}:: Bug 1624: this construct produced inconsistent brackets in the past
{2}if ERRORLEVEL{0} 2{2} goto{0} END
{4}@{2}if exist{0} a (
{2}echo{0} exists
){2} else{0} (
{2}echo{0} not
)

{2}FOR{0} /L {6}%%G{2} IN{0} (2,1,4){2} DO{0} ({2}echo{0} {6}%%G{0})

{1}:: Bug 1997: keywords not recognized when preceded by '('
{2}IF NOT DEFINED{0} var ({2}SET{0} var{7}={0}1)

{1}:: Bug 2065: keywords not recognized when followed by ')'
{4}@{2}if exist{0} a ({2} exit{0})

{1}:: Bug: with \r or \n, 'command' is seen as continuation
{2}echo{0} word ^
1
{5}command{0}

{1}:: Bug argument and variable expansion
{2}echo{0} {6}%~dp0{0}123
{2}echo{0} {6}%%-{0}~012
{2}echo{0} %%~{6}%%~-abcd{0}
{2}FOR{0} /F {6}%%I{2} in{0} ("C:\Test\temp.txt"){2} do echo{0} {6}%%~dI{0}

{1}:: Bug ending of argument and variable expansion
{2}echo{0} {6}%~dp0{0}\123
{2}echo{0} "{6}%~dp0{0}123"
{2}echo{0} "{6}%%-{0}~012"
{2}echo{0} "%%~{6}%%~-abcd{0}"
{2}FOR{0} /F {6}%%I{2} in{0} ("C:\Test\temp.txt"){2} do echo{0} "{6}%%~dI{0}"

{1}:: Bug escaped %
{2}echo{0} {6}%%0{0}
{2}echo{0} %%{6}%0{0}
{2}echo{0} %%{6}%%~-abcd{0}

{1}:: Bug 2304: "::" comments not recognised when second command on line
{2}Set{0} /A xxx{7}={6}%xxx%{7}+{0}1 {7}&{0} {1}:: Increment
{2}Set{0} /A xxx{7}={6}%xxx%{7}+{0}1 {7}&{0} {1}::Increment
{2}Set{0} /A xxx{7}={6}%xxx%{7}+{0}1 {7}&{0} {1}rem Increment
{0}
{3}:END