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Exercise: Log Filter

src/closures/exercise.md

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<!-- Copyright 2025 Google LLC SPDX-License-Identifier: CC-BY-4.0 -->

Exercise: Log Filter

Building on the generic logger from this morning, implement a Filter that uses a closure to filter log messages, sending those that pass the filtering predicate to an inner logger.

rust,compile_fail,editable
# // Copyright 2025 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include exercise.rs:setup}}

// TODO: Define and implement `Filter`.

{{#include exercise.rs:main}}