tracing

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subscriber: add feature flags to tests (#1532 )

## Motivation

Currently we can't run

```bash
cargo test -p tracing-subscriber --no-default-features
```

successfully, because there are a bunch of tests for feature flagged
APIs that are always enabled.

## Solution

This commit adds feature flags to the modules and/or individual test
cases that test feature-flagged APIs.

There are still a few doctests that use feature-flagged APIs, and will
fail with `--no-default-features`. These are primarily the examples for
various `Layer::context` methods that rely on `LookupSpan`, and use the
`Registry` type, as it's the only subscriber that *implements*
`LookupSpan`. We could consider changing these examples, either by
removing the actual use of the layers in them, or by changing them to
use a mocked-out version of the registry. However, I think it's nicer to
show how the API would be used in real life. Perhaps we should just run

```bash
cargo test -p tracing-subscriber --no-default-features--tests --lib
```

to ignore doctests when testing without default features.

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

2021-09-02 10:43:34 -07:00

duplicate_spans.rs

subscriber: add feature flags to tests (#1532 )

2021-09-02 10:43:34 -07:00

field_filter.rs

subscriber: add feature flags to tests (#1532 )

2021-09-02 10:43:34 -07:00

filter_log.rs

subscriber: add feature flags to tests (#1532 )

2021-09-02 10:43:34 -07:00

filter.rs

subscriber: add feature flags to tests (#1532 )