<div dir="ltr">On Thu, Jan 12, 2012 at 16:50, Andrew Coppin <span dir="ltr"><<a href="mailto:andrewcoppin@btinternet.com">andrewcoppin@btinternet.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">My guess is that your "debug printing" is causing something to be evaluated when it otherwise wouldn't be, causing a transaction to begin within a transaction.</div></blockquote><div><br></div>
<div>My guess is something is being lazily evaluated as usual, but if that is forced within a transaction, well, last I checked the GHC I/O system used STM internally so unsafePerformIO debug prints could well cause nested transactions. </div>
</div><div><br></div>-- <br>brandon s allbery <a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a><br>wandering unix systems administrator (available) (412) 475-9364 vm/sms<br>
<br>
</div>