I've just added the following snippet to groff_trace.tmac:
PROBLEMS
Because trace.tmac wraps the .de request (and its cousins), macro argu-
ments are expanded one level more. This causes problems if an argument
contains four backslashes or more to prevent too early expansion of the
backslash. For example, this macro call
.foo \\\\n[bar]
normally passes `\\n[bar]' to macro `.foo', but with the redefined .de
request it passes `\n[bar]' instead.
The solution to this problem is to use groff's \E escape which is an
escape character not interpreted in copy mode, for example
.foo \En[bar]
Werner
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