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# From mksh
set -o posix ; shopt -u xpg_echo
(echo 1 ${IFS+'}'z}) 2>&- || echo failed in 1
(echo 2 "${IFS+'}'z}") 2>&- || echo failed in 2
(echo 3 "foo ${IFS+'bar} baz") 2>&- || echo failed in 3
(echo -n '4 '; printf '%s\n' "foo ${IFS+"b c"} baz") 2>&- || echo failed in 4
(echo -n '5 '; printf '%s\n' "foo ${IFS+b c} baz") 2>&- || echo failed in 5
(echo 6 ${IFS+"}"z}) 2>&- || echo failed in 6
(echo 7 "${IFS+"}"z}") 2>&- || echo failed in 7
(echo 8 "${IFS+\"}\"z}") 2>&- || echo failed in 8
(echo 9 "${IFS+\"\}\"z}") 2>&- || echo failed in 9
(echo 10 foo ${IFS+'bar} baz'}) 2>&- || echo failed in 10
(echo 11 "$(echo "${IFS+'}'z}")") 2>&- || echo failed in 11
(echo 12 "$(echo ${IFS+'}'z})") 2>&- || echo failed in 12
(echo 13 ${IFS+\}z}) 2>&- || echo failed in 13
(echo 14 "${IFS+\}z}") 2>&- || echo failed in 14
u=x; (echo -n '15 '; printf '<%s> ' "foo ${IFS+a"b$u{ {"{{\}b} c ${IFS+d{}} bar" ${IFS-e{}} baz; echo .) 2>&- || echo failed in 15
l=t; (echo 16 ${IFS+h`echo -n i ${IFS+$l}h`ere}) 2>&- || echo failed in 16
l=t; (echo 17 ${IFS+h$(echo -n i ${IFS+$l}h)ere}) 2>&- || echo failed in 17
l=t; (echo 18 "${IFS+h`echo -n i ${IFS+$l}h`ere}") 2>&- || echo failed in 18
l=t; (echo 19 "${IFS+h$(echo -n i ${IFS+$l}h)ere}") 2>&- || echo failed in 19
l=t; (echo 20 ${IFS+h`echo -n i "${IFS+$l}"h`ere}) 2>&- || echo failed in 20
l=t; (echo 21 ${IFS+h$(echo -n i "${IFS+$l}"h)ere}) 2>&- || echo failed in 21
l=t; (echo 22 "${IFS+h`echo -n i "${IFS+$l}"h`ere}") 2>&- || echo failed in 22
l=t; (echo 23 "${IFS+h$(echo -n i "${IFS+$l}"h)ere}") 2>&- || echo failed in 23
key=value; (echo -n '24 '; printf '%s\n' "${IFS+'$key'}") 2>&- || echo failed in 24
key=value; (echo -n '25 '; printf '%s\n' "${IFS+"'$key'"}") 2>&- || echo failed in 25 # ksh93: “'$key'”
key=value; (echo -n '26 '; printf '%s\n' ${IFS+'$key'}) 2>&- || echo failed in 26
key=value; (echo -n '27 '; printf '%s\n' ${IFS+"'$key'"}) 2>&- || echo failed in 27
(echo -n '28 '; printf '%s\n' "${IFS+"'"x ~ x'}'x"'}"x}" #') 2>&- || echo failed in 28
u=x; (echo -n '29 '; printf '<%s> ' foo ${IFS+a"b$u{ {"{ {\}b} c ${IFS+d{}} bar ${IFS-e{}} baz; echo .) 2>&- || echo failed in 29
(echo -n '30 '; printf '<%s> ' ${IFS+foo 'b\
ar' baz}; echo .) 2>&- || (echo failed in 30; echo failed in 31)
(echo -n '32 '; printf '<%s> ' ${IFS+foo "b\
ar" baz}; echo .) 2>&- || echo failed in 32
(echo -n '33 '; printf '<%s> ' "${IFS+foo 'b\
ar' baz}"; echo .) 2>&- || echo failed in 33
(echo -n '34 '; printf '<%s> ' "${IFS+foo "b\
ar" baz}"; echo .) 2>&- || echo failed in 34
(echo -n '35 '; printf '<%s> ' ${v=a\ b} x ${v=c\ d}; echo .) 2>&- || echo failed in 35
(echo -n '36 '; printf '<%s> ' "${v=a\ b}" x "${v=c\ d}"; echo .) 2>&- || echo failed in 36
(echo -n '37 '; printf '<%s> ' ${v-a\ b} x ${v-c\ d}; echo .) 2>&- || echo failed in 37
(echo 38 ${IFS+x'a'y} / "${IFS+x'a'y}" .) 2>&- || echo failed in 38
foo="x'a'y"; (echo 39 ${foo%*'a'*} / "${foo%*'a'*}" .) 2>&- || echo failed in 39
foo="a b c"; (echo -n '40 '; printf '<%s> ' "${foo#a}"; echo .) 2>&- || echo failed in 40
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