OpenEuphoria

$ is fine by me (or the underscore) to serve as a placemarker meaning "ignore me."

I vote for underscore. In some languages there is the anonymous _ variable, which is used when the value doesn't matter.

What about the case where there are not enough RHS items to complete LHS requests? Or vice versa?

{ a } = { 1, 2, 3 } 
 
{ a, b, c } = { 1 }