Make a call assignment i.e a = 10

Property definitions

nitc $ ASTBuilder :: make_call_assign
	# Make a call assignment i.e `a = 10`
	fun make_call_assign(recv: AExpr, callsite: CallSite, n_args: nullable Collection[AExpr], n_value: AExpr): ACallAssignExpr
	do
		return new ACallAssignExpr.make(recv, callsite, n_args, n_value)
	end
src/astbuilder.nit:198,2--202,4