From 3b2e0ee6685a9b20f1b3126b3f5e582191697583 Mon Sep 17 00:00:00 2001
From: Eliza Weisman <eliza@buoyant.io>
Date: Thu, 12 Sep 2019 11:16:47 -0700
Subject: [PATCH] subscriber: emit deprecation warnings for "filter"

Signed-off-by: Eliza Weisman <eliza@buoyant.io>
---
 tracing-subscriber/src/filter/env/mod.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tracing-subscriber/src/filter/env/mod.rs b/tracing-subscriber/src/filter/env/mod.rs
index 5133e7bc1f..d3518cac53 100644
--- a/tracing-subscriber/src/filter/env/mod.rs
+++ b/tracing-subscriber/src/filter/env/mod.rs
@@ -29,6 +29,13 @@ use tracing_core::{
 /// A `Layer` which filters spans and events based on a set of filter
 /// directives.
 // TODO(eliza): document filter directive syntax?
+#[cfg_attr(
+    feature = "filter",
+    deprecated(
+        since = "0.1.2",
+        note = "the `filter` feature flag was renamed to `env-filter` and will be removed in 0.2",
+    )
+)]
 #[derive(Debug)]
 pub struct EnvFilter {
     // TODO: eventually, this should be exposed by the registry.