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Tom Lane authored
Formerly we just Assert'ed that each refcount was zero, which was quick and easy but failed to provide a good overview of what was wrong. Change the code so that we'll call PrintBufferLeakWarning() for each buffer with a nonzero refcount, and then Assert at the end of the loop. This costs nothing in runtime and might ease diagnosis of some bugs. Greg Smith, reviewed by Satoshi Nagayasu, further tweaked by me
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