Reason

From Joe Kelley at the NRC:

I am working on a 7-cell model that uses the GapHeatTransfer BC for every pair of sidesets as was done for the "reference" calculation in the extended scope task.

In that calculation, there were only two axial regions in the meshing-tools script, the support plate and everything else.

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I'm pretty sure that SimpleAssign is only created when the left-hand side is a StaticAssignable (e.g., Var, Const, or Underscore). If the target is a pattern, then it becomes a MatchAssign, and if it is some method chain (e.g. x.y = 2), then it is converted into a Call to the y= method with x as the receiver.

With that, I think that the target property of SimpleAssign no