[Issue 7177] $ should forward to length by default

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http://d.puremagic.com/issues/show_bug.cgi?id=7177



--- Comment #16 from Kenji Hara <k.hara...@gmail.com> 2013-03-21 07:59:47 PDT 
---
The idea in comment #11 is interesting, but one problem point is that current
compiler does not see UFCS fallback for operator overloading.

If we accept it, should we also accept this?

string opBinary(string op)(string s1, string s2) if (op == "+") {
    return s1 ~ s2;
}
void main() {
    assert("hello " + "world!" == "hello world!");
    // --> "hello ".opBinary!"+"("world!")    // op-overloading
    // --> .opBinary!"+"("hello ", "world!")  // UFCS
}

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