Son 1524ee4b60 trace: Add static level filtering (#987) ...

## Motivation

`tokio-trace` should have static verbosity level filtering, like the
`log` crate. The static max verbosity level should be controlled at
compile time with a set of features. It should be possible to set a
separate max level for release and debug mode builds.

## Solution

We can do this fairly similarly to how the `log` crate does it:
`tokio-trace` should export a constant whose value is set based on the
static max level feature flags. Then, we add an if statement to the
`span!` and `event!` macros which tests if that event or span's level
is enabled.

Closes #959

2019-03-25 15:19:20 -07:00

..

tests

trace: Add static level filtering (#987)

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Cargo.toml

trace: Add static level filtering (#987)

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