Follow-up Comment #3, bug #68435 (group groff): The example 'ch09.trf' contains the character '@'.
It is processed in a "default" case in the file
"src/preproc/eqn/text.cpp", which uses
lex_error("unquoted escape");
"tbl" uses '@' in
.if n \Z@\r\D'l 0 2v'@\c
so "eqn" interprets that.
Using '#' instead is OK, as is "`" (in the original ch09.t).
-.-
When the 'box' format in the input file is removed, no line drawing
commands with '\Z@...@' are present, and no warnings are issued.
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