//
        // For the example:
        //
        // class A {
        //   constructor()
        // }
        // class B: <caret>A()
        //
        // We want to resolve to the secondary constructor in A. Therefore, we check that the caret is at a supertype
        // call entry and if so we resolve the constructor callee expression.
        val userType = expression.parent as? KtUserType ?: return expression

		// passing invalid bucket names.
		{"------", false},
		{"my..bucket", false},
		{"192.168.1.1", false},
		{"$this-is-not-valid-too", false},
		{"contains-$-dollar", false},
		{"contains-^-caret", false},
		{"contains-$-dollar", false},
		{"contains-$-dollar", false},
		{"......", false},
		{"", false},
		{"a", false},
		{"ab", false},
		{".starts-with-a-dot", false},
		{"ends-with-a-dot.", false},

    ],

    // Escape metacharacters
    // which is written down by users but means special for regular expressions.

    // > There are 12 characters with special meanings:
    // > - the backslash \,
    // > - the caret ^,
    // > - the dollar sign $,
    // > - the period or dot .,
    // > - the vertical bar or pipe symbol |,
    // > - the question mark ?,
    // > - the asterisk or star *,
    // > - the plus sign +,

	// fmt.Printf("%s %+v\n", op, a)
	prog := &obj.Prog{
		Ctxt: p.ctxt,
		Pos:  p.pos(),
		As:   op,
	}
	switch len(a) {
	case 0:
		// Nothing to do.
	case 1:
		if p.arch.UnaryDst[op] || op == obj.ARET || op == obj.AGETCALLERPC {
			// prog.From is no address.
			prog.To = a[0]
		} else {
			prog.From = a[0]
			// prog.To is no address.
		}
		if p.arch.Family == sys.PPC64 && arch.IsPPC64NEG(op) {