[Groff] ".if '...'...' \# comments ..." Bug?

[Andrew J. Piziali]

   I noticed an odd behavior using groff 1.18 with the .if request and
'...'...' expression.  The following request sequence operates as
expected:

    .if '\*[FunctionalVerificationAspectsFigure]'' \
    .  ds FunctionalVerificationAspectsFigure 999

If string register FunctionalVerificationAspectsFigure is null, the .ds
request initializes it.  However, when the .if request has \# comment
appended to the line:

    .if '\*[FunctionalVerificationAspectsFigure]'' \# formatting of this
    .  ds FunctionalVerificationAspectsFigure 999

the .ds request is unconditionally executed, independent of the value of
FunctionalVerificationAspectsFigure.

   I thought the \#, and everything following it, was supposed to be
ignored so that groff sees one line:

    .if '\*[FunctionalVerificationAspectsFigure]'' .  ds 
FunctionalVerificationAspectsFigure 999


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