Log to stderr

env_logger was doing it, tracing wasn't. Make sure that both do it.

.github/workflows/publish.yml

@@ -1,4 +1,4 @@
-# Copyright (C) 2023-2024 Daniel Mueller <[email protected]>
+# Copyright (C) 2023-2025 Daniel Mueller <[email protected]>
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 name: Publish
@@ -58,7 +58,7 @@ jobs:
           --request POST \
           --url https://api.github.com/repos/${{ github.repository }}/releases \
           --header "Accept: application/vnd.github+json" \
-          --header "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}"\
+          --header "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
           --header "X-GitHub-Api-Version: 2022-11-28" \
           --data "{
               \"tag_name\":\"v${version}\",

Cargo.toml

@@ -46,14 +46,14 @@ members = ["macros"]
 
 [dependencies]
 test-log-macros = {version = "0.2.15", path = "macros"}
-tracing-subscriber = {version = "0.3.17", default-features = false, optional = true, features = ["env-filter", "fmt"]}
+tracing-subscriber = {version = "0.3.17", default-features = false, optional = true, features = ["env-filter", "fmt"], git = "https://github.com/d-e-s-o/tracing.git", branch = "topic/test-writer-stderr-v0.1.x"}
 env_logger = {version = "0.11", default-features = false, optional = true}
 
 [dev-dependencies]
 logging = {version = "0.4.8", package = "log"}
 test-case = {version = "3.1"}
 tokio = {version = "1.0", default-features = false, features = ["rt-multi-thread", "macros"]}
-tracing = {version = "0.1.20"}
+tracing = {version = "0.1.20", git = "https://github.com/d-e-s-o/tracing.git", branch = "topic/test-writer-stderr-v0.1.x"}
 
 # error: cannot find macro `__lazy_static_internal` in this scope
 #   --> ~/.cargo/registry/src/github.com-1ecc6299db9ec823/sharded-slab-0.1.4/src/tid.rs:33:1

macros/src/lib.rs

@@ -1,4 +1,4 @@
-// Copyright (C) 2019-2023 Daniel Mueller <[email protected]>
+// Copyright (C) 2019-2025 Daniel Mueller <[email protected]>
 // SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 extern crate proc_macro;
@@ -167,7 +167,9 @@ fn expand_logging_init(attribute_args: &AttributeArgs) -> Tokens {
     {
       let mut env_logger_builder = ::test_log::env_logger::builder();
       #add_default_log_filter
-      let _ = env_logger_builder.is_test(true).try_init();
+      let _ = env_logger_builder
+        .target(::test_log::env_logger::Target::Stderr)
+        .is_test(true).try_init();
     }
   }
 }
@@ -226,7 +228,7 @@ fn expand_tracing_init(attribute_args: &AttributeArgs) -> Tokens {
       let _ = ::test_log::tracing_subscriber::FmtSubscriber::builder()
         .with_env_filter(#env_filter)
         .with_span_events(__internal_event_filter)
-        .with_test_writer()
+        .with_writer(::test_log::tracing_subscriber::fmt::TestWriter::with_stderr)
         .try_init();
     }
   }