{for(;s!=$0;$0=gensub(/^([[(<{]*)(\(\)|\[\]|{}|<>)/,"\\1",1))s=$0;s?sub(/[[(<{]*/,"failed at: "):$0="yes"}NF-2?1:$3="EOL"
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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