`MallocSizeOfOps::enclosing_size_of_op` is an `Option<>` type, and the panic in
question is caused by not providing a value in a case where it's needed for
measuring a HashSet.
HashMaps and HashSets are common enough that it makes sense to make
`enclosing_size_of_op` non-optional, which this patch does.
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Source-Repo: https://github.com/servo/servo
Source-Revision: bb998dbdf31920d5ddc2a91d6bdfe8a880e11604
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 18ff3083b36733a2a212f094f249b46872b4ec61
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