[Issue 4490] New: File ref counting broken for anonymous File structs

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4490

           Summary: File ref counting broken for anonymous File structs
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2010-07-20 13:24:51 PDT ---
The following runs out of file handles on both Windows and Linux:

import std.stdio;

void main() {
    // Assumes you have a file called "foo.txt" laying around.  If you don't,
    // create one.
    while(1) {
        File("foo.txt");
    }
}

The following while loop body also does:

auto lines = File("foo.txt").byLine();

The following does not:

auto handle = File("foo.txt");

Marking as major because it silently breaks code in subtle ways.  I wrote
several small programs that relied on reference counting to free the file
handle, which seemed to work fine until one day I made them use a lot more file
handles than they usually do.

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