[Issue 20813] New: std.experimental.allocator add fault injecting allocator

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20813

          Issue ID: 20813
           Summary: std.experimental.allocator add fault injecting
                    allocator
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: witold.baryluk+d at gmail.com

A feature request of adding an allocator building block that with a given
probability simply fails to allocate memory and returns null. Otherwise
allocate from the parent. Determination can be done using per-thread random
generator for example. Extra conditions (i.e. do different probabilities for
different sizes) can be done using other allocator building blocks.

As a bonus it might be useful in some cases to fail multiple consecutive calls
to allocate(), not just do it every 1000 calls. I.e. fail 3 calls to
allocate().

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