"Structural pattern matching" for Python, part 2

"Structural pattern matching" for Python, part 2

we chose a simpler rule: named constants are only recognized when referenced via some namespace, such as `mod.var` or `Color.RED`

Oh, come on...

That is even more awful than using cryptic special characters like dots.
That means whether a variable is read from or written to depends on how I "fetch" a variable name.

The equal character would IMO be the obvious and intuitive character to mark that something is going to be assigned to.

match t:
    case (USE_RECT, real=, imag=):
	return complex(real, imag)
    case (USE_POLAR, r=, phi=):
	return complex(r * cos(phi), r * sin(phi))

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