79bb336b9c
coverage: Carve out hole spans in a separate early pass When extracting spans from MIR for use in coverage instrumentation, we sometimes need to identify *hole spans* (currently just closures), and carve up the other spans so that they don't overlap with holes. This PR simplifies the main coverage-span-refiner by extracting the hole-carving process into a separate early pass. That pass produces a series of independent buckets, and we run the span-refiner on each bucket separately. There is almost no difference in the resulting mappings, other than in some edge cases involving macros. |
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