[Issue 9700] New: std.typecons.Proxy with invaliant and in-place operation causes Access Violation

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http://d.puremagic.com/issues/show_bug.cgi?id=9700

           Summary: std.typecons.Proxy with invaliant and in-place
                    operation causes Access Violation
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2013-03-12 06:21:26 PDT ---
import std.typecons;
struct MyInt {
    int value;    
    invariant() { assert(value >= 0); }
    mixin Proxy!value;
}
void main() {
    MyInt a;
    a = 2;
    a *= 3;   // object.Error: Access Violation
}

Reduced test case:

mixin template Proxy(alias a) {
    //auto ref opOpAssign(string op, V)(V v) { return a += v; }  // NG
    auto ref opOpAssign(string op, V)(V v) { a += v; } // OK
}
struct MyInt {
    int value;
    invariant(){ assert(value >= 0); }
    mixin Proxy!value;
}
void main() {
    MyInt a = { 2 };
    a *= 3;   // object.Error: Access Violatio
}

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