===================================================================
RCS file: /cvs/mandoc/roff.7,v
retrieving revision 1.69
retrieving revision 1.73
diff -u -p -r1.69 -r1.73
--- mandoc/roff.7	2015/01/29 00:33:57	1.69
+++ mandoc/roff.7	2015/08/29 21:37:20	1.73
@@ -1,4 +1,4 @@
-.\"	$Id: roff.7,v 1.69 2015/01/29 00:33:57 schwarze Exp $
+.\"	$Id: roff.7,v 1.73 2015/08/29 21:37:20 schwarze Exp $
 .\"
 .\" Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2010, 2011, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: January 29 2015 $
+.Dd $Mdocdate: August 29 2015 $
 .Dt ROFF 7
 .Os
 .Sh NAME
@@ -665,6 +665,8 @@ produces
 .D1 \efI\e^XtFree\e^\efP.
 .Pp
 in the input stream, and thus in the output: \fI\^XtFree\^\fP.
+Each occurrence of \e\e$* is replaced with all the arguments,
+joined together with single blank characters.
 .Pp
 Since macros and user-defined strings share a common string table,
 defining a macro
@@ -1057,8 +1059,6 @@ If the first character of COND is
 .Pq string defined ,
 .Sq e
 .Pq even page ,
-.Sq r
-.Pq register accessed ,
 .Sq t
 .Pq troff mode ,
 or
@@ -1066,6 +1066,11 @@ or
 .Pq vroff mode ,
 COND evaluates to false.
 .It
+If the first character of COND is
+.Sq r ,
+it evalutes to true if the rest of COND is the name of an existing
+number register; otherwise, it evaluates to false.
+.It
 If COND starts with a parenthesis or with an optionally signed
 integer number, it is evaluated according to the rules of
 .Sx Numerical expressions
@@ -1196,13 +1201,18 @@ This is a Heirloom extension and currently unsupported
 Set an input line trap.
 Its syntax is as follows:
 .Pp
-.D1 Pf . Cm it Ar number macro
+.D1 Pf . Cm it Ar expression macro
 .Pp
 The named
 .Ar macro
-will be invoked after processing the specified
-.Ar number
-of input text lines.
+will be invoked after processing the number of input text lines
+specified by the numerical
+.Ar expression .
+While evaluating the
+.Ar expression ,
+the unit suffixes described below
+.Sx Scaling Widths
+are ignored.
 .Ss \&itc
 Set an input line trap, not counting lines ending with \ec.
 Currently unsupported.
@@ -2023,10 +2033,7 @@ Print
 with zero width and height; ignored by
 .Xr mandoc 1 .
 .Ss \ez
-Output the next character without advancing the cursor position;
-approximated in
-.Xr mandoc 1
-by simply skipping the next character.
+Output the next character without advancing the cursor position.
 .Sh COMPATIBILITY
 The
 .Xr mandoc 1