I use luatex 0.43 with yesterday's beta.  Running 
  \everymath = {\displaystyle}
  ${a\over  b}$

results in 

  ! Use of \dospecialabout doesn't match its definition.
  l.4 ${a\over  b

Plain format under luatex has no problem here.

If I change \over to \times it runs with fonts changed
to roman (i.e, not math italics).

Thank you.


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