void main()
{
    string s = q"(foo(xxx)) ";
    assert(s == "foo(xxx)");

    s = q"[foo[xxx]]";
    assert(s == "foo[xxx]");

    s = q"{foo{xxx}}";
    assert(s == "foo{xxx}");

    s = q"<foo<xxx>>";
    assert(s == "foo<xxx>");

    s = q"[foo(]";
    assert(s == "foo(");

    s = q"/foo]/";
    assert(s == "foo]");
}