> In any case, Bryn's right, the combination of a SET clause and a PARALLEL clause is implemented incorrectly in AlterFunction.
I'm taking what I've read in the responses to mean that the testcase I showed is considered to be evidence of a bug (i.e. there are no semantic restrictions) and that fix(es) are under consideration.
The test case was good. I made an uninformed assumption that proved to be untrue.
The patch was written and applied yesterday, at Tom's "Yeah, I arrived at the same fix." email.