.ig
Test whether delimiters in strings are processed at higher input level than
the surrounding context.  The string values are chosen such that both tests
should succeed with compatibility mode off and fail with compatibility mode
on.
..
.cp 0
.ds xx abc'abc
Next test should succeed:
.ie '\*(xx'xyz' test failed
.el test succeeded
.br
.ds xx abc'def
Next test should succeed:
.ie !'\*(xx'\*(xx' test failed
.el test succeeded
.br
.cp 1
.ds xx abc'abc
Next test should fail:
.ie '\*(xx'xyz' test failed
.el test succeeded
.br
.ds xx abc'def
Next test should fail:
.ie !'\*(xx'\*(xx' test failed
.el test succeeded
.br
