9bd0feeba8
As GetErrorContextStack() borrowed setup and tear-down code from other places, it was less than clear that it must only be called as a top-level entry point into the error system and can't be called by an exception handler (unlike the rest of the error system, which is set up to be reentrant-safe). Being called from an exception handler is outside the charter of GetErrorContextStack(), so add a bit more protection against it, improve the comments addressing why we have to set up an errordata stack for this function at all, and add a few more regression tests. Lack of clarity pointed out by Tom Lane; all bugs are mine. |
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