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Disable one test for now that is broken after the addition of \).
It is not broken because of \), which is correctly implemented, but
the addition merely reveals a hidden bug elsewhere, almost certainly
in \\ handling.  Given that \\ is among the most mysterious escape
sequences and using it is very strongly discouraged in manual pages,
fixing that is not urgent - and may be hard.

.\" $OpenBSD: roff.in,v 1.6 2018/08/19 23:55:40 schwarze Exp $
.TH ARGS-ROFF 1 "February 21, 2015"
.SH NAME
args-roff - arguments to roff macros
.SH DESCRIPTION
.de test
.BI (\\$1) "(\\$2)"
.br
..
arguments containing quotes:
.test a"b a"b
.de test
(\\$1) (\\$2)
.br
..
standard unquoted:
.test one two
escaped blanks:
.test one\ one two\ two
escaped 'e' character:
.test one\eone two
.\" escaped backslash before blank:  --  broken for unknown reasons
.\" .test one\\ two
escaped backslash before 'e' character:
.test one\\e two
double inter-argument space:
.test one  two
triple inter-argument space:
.test one   two
single eol blank:
.test one two 
double eol blank:
.test one two  
triple eol blank:
.test one two   
standard quoted:
.test "one" "two"
quoted quotes:
.test "one""one" """two"""
quoted whitespace:
.test "one one" "two two"
escaped 'e' characters:
.test "one \e one" "\e"
escaped backslash before blank:
.test "one\\ one" "\\ "
escaped backslash before 'e' character:
.test "one\\eone" "\\e"
double inter-argument space:
.test "one one"  "two two"
triple inter-argument space:
.test "one one"   "two two"
missing inter-argument space:
.test "one one"two\ two
single eol blank:
.test "one one" "two two" 
double eol blank:
.test "one one" "two two"  
triple eol blank:
.test "one one" "two two"   
trailing blanks in arguments:
.test "one " "two "
unterminated quotes:
.test "one
.test one "two
single trailing blank in unterminated quotes:
.test "one 
.test one "two 
double trailing blank in unterminated quotes:
.test "one  
.test one "two  
backslash at eol:
.test one two\