[Issue 4232] New: Local struct member variable can be returned by ref

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4232

           Summary: Local struct member variable can be returned by ref
           Product: D
           Version: 2.041
          Platform: x86
        OS/Version: All
            Status: NEW
          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> 2010-05-24 23:21:52 PDT ---
Using struct members bypasses the compiler check for escaping reference to
local variables.

This code should not compile:
--------------------
struct S { int a; }

ref int test()
{
    S s;
    s.a = 42;
    return s.a;
}
void main()
{
    auto p = &test(); // reference to the local variable
    assert(test() == 42); // assertion fails with -O
}
--------------------

Moreover, test() in the above example returnes a corrupted (or uninitialized)
value when optimization is on. This causes unittests for
std.functional.toDelegate() to segfault.

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