Dear Bug List,
It looks like the ability to assign to single keys broke sometime since
2.13.39
The single-key assignment works for other properties, like
nonstaff-nonstaff-spacing; only staff-staff-spacing has the problem.
-Keith
\version "2.13.42"
{ <<
\new Staff \with {
\override VerticalAxisGroup #'staff-staff-spacing
#'basic-distance = #12 % produces warning below, has no effect
% = #'( (basic-distance . 12) ) % spreads staves as expected
} c''
\new Staff c'
%{%} >> }
%{ warning: type check for `staff-staff-spacing' failed; value `((basic-distance .
12) . #<primitive-procedure
ly:axis-group-interface::calc-staff-staff-spacing>)' must be of type `list'
%}
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