chore: bump MSRV to 1.63 (#2793)

Author: davidbarsky

.github/workflows/CI.yml

@@ -169,7 +169,7 @@ jobs:
       shell: bash
 
   check-msrv:
-    # Run `cargo check` on our minimum supported Rust version (1.56.0). This
+    # Run `cargo check` on our minimum supported Rust version (1.63.0). This
     # checks with minimal versions; maximal versions are checked above.
     name: "cargo check (+MSRV -Zminimal-versions)"
     needs: check
@@ -191,7 +191,7 @@ jobs:
         - tracing-tower
         - tracing
         toolchain:
-        - 1.56.0
+        - 1.63.0
         - stable
     steps:
     - uses: actions/checkout@v3
@@ -316,9 +316,6 @@ jobs:
 
   test-features-stable:
     # Feature flag tests that run on stable Rust.
-    # TODO(david): once tracing's MSRV goes up to Rust 1.51, we should be able to switch to
-    # using cargo's V2 feature resolver (https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions)
-    # and avoid cd'ing into each crate's directory.
     name: cargo test (feature-specific)
     needs: check
     runs-on: ubuntu-latest
@@ -331,30 +328,22 @@ jobs:
         override: true
     - name: "Test log support"
       run: cargo test
-      working-directory: "tracing/test-log-support"
     - name: "Test static max level"
       run: cargo test
-      working-directory: "tracing/test_static_max_level_features"
     - name: "Test static max level (release)"
       run: cargo test --release
-      working-directory: "tracing/test_static_max_level_features"
     - name: "Test tracing-core no-std support"
       run: cargo test --no-default-features
-      working-directory: tracing-core
     - name: "Test tracing no-std support"
-      run: cargo test --lib --no-default-features
-      working-directory: tracing
+      run: cargo test --no-default-features
       # this skips running doctests under the `--no-default-features` flag,
       # as rustdoc isn't aware of cargo's feature flags.
     - name: "Test tracing-subscriber no-std support"
       run: cargo test --lib --tests --no-default-features
-      working-directory: tracing-subscriber
     - name: "Test tracing-subscriber with liballoc only"
       run: cargo test --lib --tests --no-default-features --features "alloc"
-      working-directory: tracing-subscriber
     - name: "Test tracing-subscriber with no default features"
       run: cargo test --lib --tests --no-default-features --features "std"
-      working-directory: tracing-subscriber
 
   # all required checks except for the main test run (which we only require
   # specific matrix combinations from)

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-
+resolver = "2"
 members = [
     "tracing",
     "tracing-core",

README.md

@@ -252,7 +252,7 @@ attachment that `Future::instrument` does.
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.56. The current Tracing version is not guaranteed to build on Rust
+version is 1.63. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio

examples/Cargo.toml

@@ -3,7 +3,7 @@ name = "tracing-examples"
 version = "0.0.0"
 publish = false
 edition = "2018"
-rust-version = "1.56.0"
+rust-version = "1.63.0"
 
 [features]
 default = []

tracing-attributes/Cargo.toml

@@ -28,7 +28,7 @@ keywords = ["logging", "tracing", "macro", "instrument", "log"]
 license = "MIT"
 readme = "README.md"
 edition = "2018"
-rust-version = "1.56.0"
+rust-version = "1.63.0"
 
 [lib]
 proc-macro = true

tracing-attributes/README.md

@@ -37,7 +37,7 @@ structured, event-based diagnostic information. This crate provides the
 
 Note that this macro is also re-exported by the main `tracing` crate.
 
-*Compiler support: [requires `rustc` 1.56+][msrv]*
+*Compiler support: [requires `rustc` 1.63+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -69,7 +69,7 @@ pub fn my_function(my_arg: usize) {
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.56. The current Tracing version is not guaranteed to build on Rust
+version is 1.63. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio

tracing-attributes/src/attr.rs

@@ -268,19 +268,14 @@ impl Parse for Skips {
     }
 }
 
-#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+#[derive(Clone, Debug, Hash, PartialEq, Eq, Default)]
 pub(crate) enum FormatMode {
+    #[default]
     Default,
     Display,
     Debug,
 }
 
-impl Default for FormatMode {
-    fn default() -> Self {
-        FormatMode::Default
-    }
-}
-
 #[derive(Clone, Debug)]
 pub(crate) struct Fields(pub(crate) Punctuated<Field, Token![,]>);
 

tracing-attributes/src/lib.rs

@@ -6,7 +6,7 @@
 //!
 //! Note that this macro is also re-exported by the main `tracing` crate.
 //!
-//! *Compiler support: [requires `rustc` 1.56+][msrv]*
+//! *Compiler support: [requires `rustc` 1.63+][msrv]*
 //!
 //! [msrv]: #supported-rust-versions
 //!
@@ -41,7 +41,7 @@
 //! ## Supported Rust Versions
 //!
 //! Tracing is built against the latest stable release. The minimum supported
-//! version is 1.56. The current Tracing version is not guaranteed to build on
+//! version is 1.63. The current Tracing version is not guaranteed to build on
 //! Rust versions earlier than the minimum supported version.
 //!
 //! Tracing follows the same compiler support policies as the rest of the Tokio

tracing-core/Cargo.toml

@@ -24,7 +24,7 @@ categories = [
 ]
 keywords = ["logging", "tracing", "profiling"]
 edition = "2018"
-rust-version = "1.56.0"
+rust-version = "1.63.0"
 
 [features]
 default = ["std", "valuable/std"]

tracing-core/README.md

@@ -53,7 +53,7 @@ The crate provides:
 In addition, it defines the global callsite registry and per-thread current
 dispatcher which other components of the tracing system rely on.
 
-*Compiler support: [requires `rustc` 1.56+][msrv]*
+*Compiler support: [requires `rustc` 1.63+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -99,7 +99,7 @@ The following crate feature flags are available:
 ## Supported Rust Versions
 
 Tracing is built against the latest stable release. The minimum supported
-version is 1.56. The current Tracing version is not guaranteed to build on Rust
+version is 1.63. The current Tracing version is not guaranteed to build on Rust
 versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio