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Thanks for looking at the patch.
Attached is an updated version (again against py3k) which adds tests to Lib/test/test_peepholer.py, for both the new folding away of BUILD_SET, and for the pre-existing folding of BUILD_LIST (which didn't seem to have tests).
Hopefully these look good. One possible worry I had with them is with the string comparison against repr(various frozensets) for the disassembly of the bytecode: the new tests thus assume that the ordering of the repr of a frozenset is constant. Is this a reasonable assumption, or should the choice of test items be changed to ones with more robust ordering in their repr() string?