master: clean up warnings

Cargo.toml

@@ -18,3 +18,8 @@ members = [
     "tracing-journald",
     "examples"
 ]
+
+ # This will be ignored with Rust older than 1.74, but for now that's okay;
+ # we're only using it to fix check-cfg issues that first appeared in Rust 1.80.
+[workspace.lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ["cfg(flaky_tests)", "cfg(tracing_unstable)"] }

examples/Cargo.toml

@@ -50,3 +50,6 @@ tempfile = "3.3.0"
 # fmt examples
 snafu = "0.6.10"
 thiserror = "1.0.31"
+
+[lints]
+workspace = true

tracing-attributes/Cargo.toml

@@ -60,3 +60,6 @@ rustversion = "1.0.9"
 
 [badges]
 maintenance = { status = "experimental" }
+
+[lints]
+workspace = true

tracing-attributes/tests/instrument.rs

@@ -100,8 +100,7 @@ fn fields() {
 
 #[test]
 fn skip() {
-    #[allow(dead_code)]
-    struct UnDebug(pub u32);
+    struct UnDebug();
 
     #[instrument(target = "my_target", level = "debug", skip(_arg2, _arg3))]
     fn my_fn(arg1: usize, _arg2: UnDebug, _arg3: UnDebug) {}
@@ -135,8 +134,8 @@ fn skip() {
         .run_with_handle();
 
     with_default(collector, || {
-        my_fn(2, UnDebug(0), UnDebug(1));
-        my_fn(3, UnDebug(0), UnDebug(1));
+        my_fn(2, UnDebug(), UnDebug());
+        my_fn(3, UnDebug(), UnDebug());
     });
 
     handle.assert_finished();

tracing-core/Cargo.toml

@@ -39,4 +39,11 @@ once_cell = { version = "1.13.0", optional = true }
 
 [package.metadata.docs.rs]
 all-features = true
-rustdoc-args = ["--cfg", "docsrs"]
+# enable unstable features in the documentation
+rustdoc-args = ["--cfg", "docsrs", "--cfg", "tracing_unstable"]
+# it's necessary to _also_ pass `--cfg tracing_unstable` to rustc, or else
+# dependencies will not be enabled, and the docs build will fail.
+rustc-args = ["--cfg", "tracing_unstable"]
+
+[lints]
+workspace = true

tracing-core/src/field.rs

@@ -999,9 +999,8 @@ mod test {
     use crate::metadata::{Kind, Level, Metadata};
 
     // Make sure TEST_CALLSITE_* have non-zero size, so they can't be located at the same address.
-    #[allow(dead_code)]
-    struct TestCallsite1(u8);
-    static TEST_CALLSITE_1: TestCallsite1 = TestCallsite1(0);
+    struct TestCallsite1();
+    static TEST_CALLSITE_1: TestCallsite1 = TestCallsite1();
     static TEST_META_1: Metadata<'static> = metadata! {
         name: "field_test1",
         target: module_path!(),
@@ -1021,9 +1020,8 @@ mod test {
         }
     }
 
-    #[allow(dead_code)]
-    struct TestCallsite2(u8);
-    static TEST_CALLSITE_2: TestCallsite2 = TestCallsite2(0);
+    struct TestCallsite2();
+    static TEST_CALLSITE_2: TestCallsite2 = TestCallsite2();
     static TEST_META_2: Metadata<'static> = metadata! {
         name: "field_test2",
         target: module_path!(),

tracing-futures/Cargo.toml

@@ -52,3 +52,6 @@ maintenance = { status = "actively-developed" }
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true

tracing-futures/src/executor/futures_01.rs

@@ -35,7 +35,7 @@ where
 }
 
 #[cfg(feature = "tokio")]
-#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
+#[allow(unreachable_pub, unused_imports)] // https://github.com/rust-lang/rust/issues/57411
 pub use self::tokio::*;
 
 #[cfg(feature = "tokio")]

tracing-futures/src/executor/mod.rs

@@ -3,5 +3,6 @@ mod futures_01;
 
 #[cfg(feature = "futures-03")]
 mod futures_03;
+#[allow(unreachable_pub, unused_imports)]
 #[cfg(feature = "futures-03")]
-pub use self::futures_03::*;
+pub use futures_03::*;

tracing-futures/tests/std_future.rs

@@ -55,7 +55,7 @@ fn span_on_drop() {
         }
     }
 
-    #[allow(dead_code)]
+    #[allow(dead_code)] // Field unused, but logs on `Drop`
     struct Fut(Option<AssertSpanOnDrop>);
 
     impl Future for Fut {

tracing-journald/Cargo.toml

@@ -25,3 +25,5 @@ serde_json = "1.0.82"
 serde = { version = "1.0.139", features = ["derive"] }
 tracing = { path = "../tracing", version = "0.2" }
 
+[lints]
+workspace = true

tracing-log/Cargo.toml

@@ -37,3 +37,6 @@ maintenance = { status = "actively-maintained" }
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true

tracing-macros/Cargo.toml

@@ -25,3 +25,6 @@ tracing-subscriber = { path = "../tracing-subscriber", version = "0.3" }
 
 [badges]
 maintenance = { status = "experimental" }
+
+[lints]
+workspace = true

tracing-mock/Cargo.toml

@@ -28,3 +28,6 @@ tokio-stream = "0.1.9"
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true

tracing-serde/Cargo.toml

@@ -31,3 +31,6 @@ serde_json = "1.0.82"
 
 [badges]
 maintenance = { status = "experimental" }
+
+[lints]
+workspace = true

tracing-subscriber/Cargo.toml

@@ -36,6 +36,7 @@ json = ["tracing-serde", "serde", "serde_json"]
 # Enables support for local time when using the `time` crate timestamp
 # formatters.
 local-time = ["time/local-offset"]
+nu-ansi-term = ["dep:nu-ansi-term"]
 
 [dependencies]
 tracing-core = { path = "../tracing-core", version = "0.2", default-features = false }
@@ -103,6 +104,5 @@ harness = false
 name = "enter"
 harness = false
 
-[[bench]]
-name = "reload"
-harness = false
+[lints]
+workspace = true

tracing-subscriber/src/fmt/format/mod.rs

@@ -679,7 +679,6 @@ impl<F, T> Format<F, T> {
     ///
     /// - [`Format::flatten_event`] can be used to enable flattening event fields into the root
     ///   object.
-    ///
     #[cfg(feature = "json")]
     #[cfg_attr(docsrs, doc(cfg(feature = "json")))]
     pub fn json(self) -> Format<Json, T> {

tracing-subscriber/src/fmt/time/chrono_crate.rs

@@ -109,18 +109,15 @@ impl FormatTime for ChronoUtc {
 ///
 /// [`chrono::format::strftime`]: https://docs.rs/chrono/0.4.9/chrono/format/strftime/index.html
 #[derive(Debug, Clone, Eq, PartialEq)]
+#[derive(Default)]
 enum ChronoFmtType {
     /// Format according to the RFC 3339 convention.
+    #[default]
     Rfc3339,
     /// Format according to a custom format string.
     Custom(String),
 }
 
-impl Default for ChronoFmtType {
-    fn default() -> Self {
-        ChronoFmtType::Rfc3339
-    }
-}
 
 #[cfg(test)]
 mod tests {

tracing-subscriber/src/fmt/time/datetime.rs

@@ -192,7 +192,6 @@
 // permissive licensing, and of not having licensing issues being an
 // obstacle to adoption, that text has been removed.
 
-
 use std::fmt;
 
 /// A date/time type which exists primarily to convert `SystemTime` timestamps into an ISO 8601
@@ -332,6 +331,7 @@ impl From<std::time::SystemTime> for DateTime {
 
 #[cfg(test)]
 mod tests {
+    use i32;
     use std::time::{Duration, UNIX_EPOCH};
 
     use super::*;
@@ -381,6 +381,8 @@ mod tests {
             1,
         );
 
+        case("2038-01-19T03:14:07.000000Z", i32::MAX as i64, 0);
+        case("2038-01-19T03:14:08.000000Z", i32::MAX as i64 + 1, 0);
         case("2038-01-19T03:14:07.000000Z", i32::MAX as i64, 0);
         case("2038-01-19T03:14:08.000000Z", i32::MAX as i64 + 1, 0);
         case("1901-12-13T20:45:52.000000Z", i32::MIN as i64, 0);
@@ -391,6 +393,8 @@ mod tests {
         // high date value tests to panic
         #[cfg(not(target_os = "windows"))]
         {
+            case("+292277026596-12-04T15:30:07.000000Z", i64::MAX, 0);
+            case("+292277026596-12-04T15:30:06.000000Z", i64::MAX - 1, 0);
             case("+292277026596-12-04T15:30:07.000000Z", i64::MAX, 0);
             case("+292277026596-12-04T15:30:06.000000Z", i64::MAX - 1, 0);
             case("-292277022657-01-27T08:29:53.000000Z", i64::MIN + 1, 0);

tracing-subscriber/src/lib.rs

@@ -214,7 +214,7 @@ feature! {
     /// implementation which tracks per-span data and exposes it to
     /// [`Subscribe`]s.
     ///
-    /// For more information see [`Registry`].
+    /// Returns a default [`Registry`].
     pub fn registry() -> Registry {
         Registry::default()
     }

tracing-subscriber/src/registry/sharded.rs

@@ -349,6 +349,7 @@ impl Collect for Registry {
         let refs = span.ref_count.fetch_sub(1, Ordering::Release);
         if !std::thread::panicking() {
             assert!(refs < usize::MAX, "reference count overflow!");
+            assert!(refs < usize::MAX, "reference count overflow!");
         }
         if refs > 1 {
             return false;
@@ -588,7 +589,7 @@ mod tests {
         closed: Vec<(&'static str, Weak<()>)>,
     }
 
-    #[allow(dead_code)]
+    #[allow(dead_code)] // Field is exercised via checking `Arc::downgrade()`
     struct SetRemoved(Arc<()>);
 
     impl<C> Subscribe<C> for CloseSubscriber

tracing-tower/Cargo.toml

@@ -40,3 +40,6 @@ maintenance = { status = "experimental" }
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true

tracing/Cargo.toml

@@ -108,4 +108,11 @@ maintenance = { status = "actively-developed" }
 
 [package.metadata.docs.rs]
 all-features = true
-rustdoc-args = ["--cfg", "docsrs"]
+# enable unstable features in the documentation
+rustdoc-args = ["--cfg", "docsrs", "--cfg", "tracing_unstable"]
+# it's necessary to _also_ pass `--cfg tracing_unstable` to rustc, or else
+# dependencies will not be enabled, and the docs build will fail.
+rustc-args = ["--cfg", "tracing_unstable"]
+
+[lints]
+workspace = true

tracing/tests/instrument.rs

@@ -21,7 +21,7 @@ fn span_on_drop() {
         }
     }
 
-    #[allow(dead_code)]
+    #[allow(dead_code)] // Field not used, but logs on `Drop`
     struct Fut(Option<AssertSpanOnDrop>);
 
     impl Future for Fut {