[Issue 6522] New: [CTFE] Problem with opAssign call in foreach(ref)

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6522

           Summary: [CTFE] Problem with opAssign call in foreach(ref)
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-08-17 11:14:58 PDT ---
Reduced code (Foo originally was BigInt):


struct Foo {
    bool b = false;
    void opAssign(int x) {
        this.b = true;
    }
}
int foo() {
    Foo[1] array;
    foreach (ref item; array)
        item = 1;
    return 0;
}
enum r = foo(); // error
void main() {
//    const r = foo(); // OK
}


DMD 2.055beta gives:

test.d(9): Error: variable __key4 is used before initialization
test.d(10): Error: cannot evaluate item.opAssign(1) at compile time
test.d(13): Error: cannot evaluate foo() at compile time

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