[Groff] strings on successive lines bug?

[Dorai Sitaram]

There seems to be a bug in the way strings on
consecutive lines are expanded.
Here is an example file.

.ds one 1
.ds two 2
.one
.two

Only the first string, .one, gets translated.  So
output looks like

1.two

If I put a blank line between .one and .two, they
both get translated, but the blank line gets eaten.
Output:

1 2

If I put two blanks lines between .one and .two, both
strings get translated, and I get one blank line
between them in the output.

--d