[Issue 10758] New: Unsound type checking for inout.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10758

           Summary: Unsound type checking for inout.
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: timon.gehr at gmx.ch


--- Comment #0 from timon.gehr at gmx.ch 2013-08-04 16:01:37 PDT ---
With DMD, inout can be used to coerce away immutability as follows:

int* foo(inout(int)* x)@safe{
    inout(int)* screwUp(inout(int)*){ return x; }
    return screwUp((int*).init);
}

void main(){
    immutable x = 123;
    static assert(is(typeof(*&x)==immutable));
    assert(*&x==123);
    immutable(int)* y = &x;
    *foo(y)=456;
    assert(*&x==456);
    assert(x!=*&x); // (!)
}

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