rust-dirs-multiset: improve temporary error message...
rust-dirs-multiset: improve temporary error message
While we wait on a future patch that could verify that the paths passed to
`DirsMultiset` have been audited, we still need to handle this error.
This patch makes it easier to bubble up and makes the error clearer.
Also, this patch introduces the `subslice_index` function that could be useful
for other - albeit niche - purposes.
Differential Revision:
https://phab.mercurial-scm.org/D7921