[Haskell-cafe] STM and unsafePerformIO/bracket

[Bertram Felgenhauer]

Rob Leslie wrote:
> I’ve run into a difficulty I’d appreciate some advice to solve.
[unsafePerformIO and bracket, within an STM transaction]

There's a long-standing bug report for this issue,

  https://ghc.haskell.org/trac/ghc/ticket/2401

So the current situation is that bracket within unsafePerformIO
(and unsafeIOToSTM) and STM transactions don't mix. I'm a bit
surprised that this doesn't bite more people.

Cheers,

Bertram