[Bug 193759] New: Wrong behaviour of IFS='|' set in /bin/sh

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193759

            Bug ID: 193759
           Summary: Wrong behaviour of IFS='|' set in /bin/sh
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: michipili at gmail.com

Using IFS to set positional parameters as in

  IFS='|' set -- $line

displays erratic behaviour.  In the script below, the expected output is

  A-1-2
  B-1-2
  C-1-2

but the first splitting is handled specially and we get

  A|1|2--
  B-1-2
  C-1-2

----8<----
mock()
{
    cat <<EOF
A|1|2
B|1|2
C|1|2
EOF
}

demonstrate()
{
    while read line; do
    IFS='|' set -- $line
    printf '%s-%s-%s\n' "$1" "$2" "$3"
    done
}

mock | demonstrate
---->8----

Note that splitting twice fixes the output.

----8<----
demonstrate2()
{
    while read line; do
        # The following line has been intentionally duplicated
    IFS='|' set -- $line
    IFS='|' set -- $line
    printf '%s-%s-%s\n' "$1" "$2" "$3"
    done
}

mock | demonstrate2
---->8----

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