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Test handling of escaped backslashes because the code related to
copy mode is complicated and prone to regressions.

.\" $OpenBSD: bs_man.in,v 1.1 2019/01/17 06:29:14 schwarze Exp $
.TH ESC-BS_MAN 1 "January 17, 2019"
.SH NAME
esc-bs_man \- escaped backslashes in man(7) code
.SH DESCRIPTION
.ds usestr (initial)
.de testmac
prefix\*[usestr]suffix
prefix\\*[usestr]suffix
..
.ds teststr prefix\*[usestr]middle\\*[usestr]suffix
.ds usestr (later)
on a text line: prefix\\suffix
.PP
in a macro definition:
.testmac
.PP
in a string definition: \*[teststr]
.PP
in a high-level macro argument:
.IB prefix ##\\*[usestr]## suffix
.PP
.de argmac
{\\$1}
..
in a user-defined macro argument:
.argmac prefix\\*[usestr]suffix