[Issue 8844] New: Warning for bug-prone operator overloading

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8844

           Summary: Warning for bug-prone operator overloading
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: diagnostic
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2012-10-17 15:46:15 PDT ---
struct Foo {
    Foo opBinary(string op="-")(Foo f) {
        return Foo();
    }
}
void main() {
    auto Foo = Foo() + Foo();
}


Compiles and run with no errors, dmd 2.061alpha, because "-" is a default
argument for the op template argument, so that code is formally correct. But
I'd like a warning here (or an error?), because I think such code is bug-prone.

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