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Fix manifest parsing#250

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mdboom wants to merge2 commits intopython:main
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I'm a little unclear about how the manifest parsing is supposed to work, so I'm not sure this is the correct solution.

To reproduce the bug, use a "meta" manifest file that loads both the pyperformance suite and the pyston python-macrobenchmarks suite (as we do in our infra for the faster-cpython project):

[includes]<default>~benchmarking/BENCH/repositories/pyston-benchmarks/benchmarks/MANIFEST

There seems to be two bugs:

Both pyperformance and pyston have an empty[group default] entry. I'm not 100% sure what that is supposed to do in practice, but it causes the "a group named default was already defined" error to raise. Here, I just make the groups concatenate instead.

The pyston manifest has:

[group all]-json

It seems like thisshould be valid, but the code here disallows any mention ofall.

Again, I have no idea if this fix is correct, but it does at least let these two suites of benchmarks combine correctly.

if name == 'all':
raise ValueError('a group named "all" is not allowed ("all" is reserved for selecting the full set of declared benchmarks)')

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This should still be the case. So the Pyston benchmarks' manifest needs to be fixed.

if entries is None:
if name in self._raw_groups:
return
self._raw_groups[name] = None
elif name in self._raw_groups and self._raw_groups[name] is not None:
raise ValueError(f'a group named {name} was already defined')
self._raw_groups[name].extend(list(entries) if entries else [])

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This rule should apply for a single manifest, with the exception only for includes (which should be merged like you are doing). I expect the logic for distinguishing between the two cases is lacking, either in `_parse_manifest() below or in the code that consumes its output.

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@ericsnowcurrentlyericsnowcurrentlyericsnowcurrently requested changes

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