amsmath: suspicious \@arrayboxrestore

[nbeisert]

This is a very brief report: amsmath.dtx makes a suspicious definition of \@arrayboxrestore as follows:

latex2e/required/amsmath/amsmath.dtx

Line 3122 in 0e10f72

\edef\@arrayboxrestore{\the\toks@}

Issues:

• I could not find any other reference to \@arrayboxrestore in amsmath or any other package in my latex installation (grep -R @arrayboxrestore).
• This definition hardly makes sense as is.
• \@arrayboxrestore extends the definition of \@arrayparboxrestore in the previous line:
  

  latex2e/required/amsmath/amsmath.dtx

  Line 3121 in 0e10f72

  \toks@\@xp{\@arrayparboxrestore \let\label\ltx@label}%

• Shouldn't \@arrayboxrestore be \@arrayparboxrestore? With the suggested change, the intention of this pair of lines appears straight-forward: append \let\label\ltx@label to \@arrayparboxrestore in place.
• I have no idea about the practical implications (of implementing the change or discarding it).

[u-fischer]

looks definitively like a typo. Which probably shows that nobody uses a labeled enumerate inside a minipage inside an equation ...