[bug #61089] [troff] assertion failed: 'desired_space.is_zero() && nspaces == 0'

[John Gardner]

Follow-up Comment #9, bug #61089 (project groff):

> John, is this enough information for you to put together a (much) smaller
reproducer? 

Aye, I narrowed it down to the following test-case:


01 .de _
02 .    na
03 .    nh
04 .    ll 0
05 .    di A
06 \&\\$1
07 .    di
08 .    br
09 ..
10 ._ " XYZ"


Removing \& from line 6 causes the error to disappear, as does passing "XYZ"
without a leading space; i.e.,

._ "XYZ"

but not

._ " XYZ"



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