> This problem we have seen before, and I think it was a luatex bug then.
> Which luatex is this ? 0.60.1 ?

It was .50, so I updated to .60.  I'm still getting errors with the
same behavior, e.g.:

% block of text
block of text

and

block of text
% block of text

work, but

block of text
block of text

doesn't.  The difference is that now they are reporting differently:

" ! Undefined control sequence.
<argument> \@@bklocation
\processaction ...-> \expandaction \!!stringa{#1

              } \ifx \!!stringa \empty \l..."


In addition, everything involving inferiors, superiors, numerators and
denominators is now broken.  For example:

\definefontfeature[in][body][sinf=yes]%inferior
Cs{\setff{in}133}

has no effect.

> Also, debugging this really needs a complete test input file.

I don't know how to make one.
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