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subscriber: document Subscriber::with_test_writer() limitations #3186

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subscriber: document Subscriber::with_test_writer() limitations #3186

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3 changes: 3 additions & 0 deletions tracing-subscriber/src/fmt/fmt_subscriber.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -266,6 +266,8 @@ impl<C, N, E, W> Subscriber<C, N, E, W> {
///
/// See [`TestWriter`] for additional details.
///
/// This method replaces any writer previously configured by [`with_writer`].
///
/// # Examples
///
/// Using [`TestWriter`] to let `cargo test` capture test output:
Expand All @@ -283,6 +285,7 @@ impl<C, N, E, W> Subscriber<C, N, E, W> {
/// [capturing]:
/// https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output
/// [`TestWriter`]: super::writer::TestWriter
/// [`with_writer`]: Subscriber::with_writer
pub fn with_test_writer(self) -> Subscriber<C, N, E, TestWriter> {
Subscriber {
fmt_fields: self.fmt_fields,
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