It looks like this is -- like a lot of plpgsql patches -- having difficulty catching the attention of reviewers and committers. Aleksander asked for a test and Pavel put quite a bit of work into adding a good test case. I actually like that there's a test because it shows the API can be used effectively.
>From my quick skim of this code it does indeed look like it's ready to commit. It's mostly pretty mechanical code to expose a couple fields so that a debugger can see them. Pavel, are you planning to add a debugger to contrib using this? The test example code looks like it would already be kind of useful even in this form.
