Follow-up Comment #1, bug #64131 (project groff):
[comment #0 original submission:]
> .tm .u=\n[.u]
> .u=1
> .rr .u
> .tm .u=\n[.u]
> .u=troff: backtrace: file '<standard input>':2
> troff:<standard input>:2: warning: register '.u' not defined
>
> Seriously?
>
> Is this AT&T troff compatible?
No, it is not.
$ DWBHOME=. ./bin/nroff
.tm .u=\n(.u
.u=1
.rr .u
.tm .u=\n(.u
.u=1
.nr .u 2
.tm .u=\n(.u
.u=1
.tm .f=\n(.f
.f=1
.rr .f
.tm .f=\n(.f
.f=1
.ex
Stop the madness.
Maybe lock down the .T string, too.
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