[Issue 5117] New: [CTFE] Member function call with chained dots: side effects ignored

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5117

           Summary: [CTFE] Member function call with chained dots: side
                    effects ignored
           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: rsinfu at gmail.com


--- Comment #0 from Shin Fujishiro <rsinfu at gmail.com> 2010-10-25 09:09:49 PDT ---
The interpretor neglects member functions mutating 'this' if a function call
involves two or more chained dot expressions.  In the following repro,
s.change() succeeds in mutating 'this' but r.s.change() does not:
--------------------
static int dummy = test();

int test()
{
    S s;
    s.change();
    assert(s.value == 1);       // (7) succeeds

    R r;
    r.s.change();
    assert(r.s.value == 1);     // (11) fails, value == 0

    return 0;
}

struct S
{
    int value;
    void change() { value = 1; }
}

struct R
{
    S s;
}
--------------------
% dmd -o- -c test.d
test.d(11): Error: assert(r.s.value == 1) failed
test.d(1): Error: cannot evaluate test() at compile time
test.d(1): Error: cannot evaluate test() at compile time
--------------------

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