Follow-up Comment #1, bug #58718 (project groff):
Bug #64519 observes that a hyphen likewise cannot be the first element of a
kern pair.
Arguably these are two examples of the same limitation. (There may be others;
I did not test every character.) But I feel #64519 is the easier to solve
because it doesn't require any font file syntax change: it's already possible
to specify a kern pair that starts with a hyphen, but groff ignores such a
pair. Specifying a space as an element of a kern pair requires a different
syntax, since currently spaces in the kernpair section are delimiters. So to
me this justifies filing them as separate bug reports.
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