'man groff' reports end of file while defining macro `TP'

[Paul Eggert]

GROFF VERSION:
1.19

MACHINE:
SunUltra 1/170E

OS:
Solaris 9

COMPILER:
GCC 3.3

INPUT FILES:
none

COMMAND LINE:
man groff

or, here's another way to reproduce the problem:

groff -man -Tascii src/roff/groff/groff.n

DESCRIPTION OF INCORRECT BEHAVIOUR:

/opt/reb/share/man/man1/groff.1:57: error: end of file while defining macro `TP'
troff: warning: numeric expression expected (got `\')

SUGGESTED FIX [optional]:

I tried renaming the "TP+" macro to "Tq", and this changed the error
message to talk about the macro "Te", so I'm lost.  Perhaps it's a bug
in groff itself, rather than in the macros?