[bug #60571] Footnote markers defeat end-of-sentence recognition

[Dave]

Follow-up Comment #7, bug #60571 (project groff):

My fleeting concern with that was potential parsing ambiguity if a long
register name ends in a backslash: are there cases where the \] signifying the
end of the register name in the \n[] escape are confusable with the proposed
\] escape?

To see if this was an actual concern, I first looked in the Identifiers node
of the Texinfo document.  It claims that of printable characters, only those
considered whitespace are ineligible in identifiers.  So the backslash should
be legal.

But it isn't:

$ groff <<< '.nr a\ 1'
troff:<standard input>:1: error: '\ ' is not allowed in a name
troff:<standard input>:1: warning: numeric expression expected (got '\ ')


In conclusion, I'm good with \] as an escape, but need to open a new
documentation bug.

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