598d189e9b
Move variable into the only branch where it is relevant At the `if` branch `filter` (the `let` binding) is `None` iff `filter` (the parameter) was `None`. We can branch on the parameter, move the binding into the `if`, and the complexity of handling `Option<Option<_>` largely dissolves. `@rustbot` modify labels +C-cleanup +T-compiler Note: I have no idea how hot this code is. If this method frequently gets called with a `None` filter, there might be a small perf improvement. |
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