[Issue 7766] New: (Full Closures) Chain of nested functions fails

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7766

           Summary: (Full Closures) Chain of nested functions fails
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Windows
            Status: NEW
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: xinok at live.com


--- Comment #0 from Xinok <xinok at live.com> 2012-03-24 19:43:02 PDT ---
In the following code, you'd expect it to print 365. However, it prints a
random number instead. The issue is that 'value' is referred to by 'foo', which
is referred to by 'foo2'. DMD fails to detect this chain, so 'value' is
allocated on the stack, not the heap. Once the function 'clbug' returns,
'value' is popped from the stack and so it ends up printing a random number.

value -> foo -> foo2

void main(){
    clbug()();
}

int delegate() clbug(){
    int value = 365;
    int foo(){
        writeln(value);
        return value;
    }
    int foo2(){
        return foo();
    }
    return &foo2;
}

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