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# First try some invalid patterns. Do in subshell due to parsing error.
# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
"$THIS_SH" -c 'echo ${=}' SHELL
"$THIS_SH" -c 'echo ${:=}' SHELL
# now some funky ones
"$THIS_SH" -c 'echo ${#=}' SHELL
"$THIS_SH" -c 'echo ${#:=}' SHELL
# should error out
"$THIS_SH" -c 'set --; echo _${1=}' SHELL
"$THIS_SH" -c 'set --; echo _${1:=}' SHELL
"$THIS_SH" -c 'set --; echo _${1=word}' SHELL
"$THIS_SH" -c 'set --; echo _${1:=word}' SHELL
# should not error
"$THIS_SH" -c 'set aa; echo _${1=}' SHELL
"$THIS_SH" -c 'set aa; echo _${1:=}' SHELL
"$THIS_SH" -c 'set aa; echo _${1=word}' SHELL
"$THIS_SH" -c 'set aa; echo _${1:=word}' SHELL
# should work fine
unset f; echo _$f
unset f; echo _${f=}
unset f; echo _${f:=}
unset f; echo _${f=word}
unset f; echo _${f:=word}
f=; echo _$f
f=; echo _${f=}
f=; echo _${f:=}
f=; echo _${f=word}
f=; echo _${f:=word}
f=fff; echo _$f
f=fff; echo _${f=}
f=fff; echo _${f:=}
f=fff; echo _${f=word}
f=fff; echo _${f:=word}
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