[texhax] aligned nested in a multlined nested in an align

[Ignacy Gawedzki]

Hi everybody,

It's been already a few times when I wanted to nest an aligned environment in
a multlined environment (from mathtools), itself being nested in an align
environment.  As soon as there are '&' in the aligned environment, LaTeX
complains:

  ERROR: Argument of \multlined has an extra }.

Example code:

  \documentclass{article}
  \usepackage{mathtools}
  \begin{document}
  \begin{align}
    \begin{multlined}
      \begin{aligned}
        &a
      \end{aligned}
    \end{multlined}
  \end{align}
  \end{document}

So far, I've had to resign myself not to use that combination, but I don't see
anything that's fundamentally wrong in wanting it to work this way.

Does anybody have a solution?

-- 
To err is human, to purr feline.