update to tracing-tree 0.1.10, which does not pull in syn #10165
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I've updated tracing-tree to 0.1.10, which does not pull in syn and proc-macro2 (thanks for the PR, @matklad!).
It took a little bit more work than I expected to land davidbarsky/tracing-tree#33, but I should get that done this week. However, I didn't want to keep y'all waiting, so here's some of the changes that should hopefully improve your compile times.