Run cargo fmt in CI

.github/workflows/ci.yml

@@ -31,6 +31,7 @@ jobs:
       - name: Install tools
         run: |
           rustup install nightly
+          rustup component add rustfmt --toolchain nightly
           cargo install cargo-license || true
           cargo install cargo-sort    || true
 

cast_checks/tests/ci.rs

@@ -29,6 +29,14 @@ fn clippy() {
         .success();
 }
 
+#[test]
+fn format() {
+    Command::new("rustup")
+        .args(["run", "nightly", "cargo", "fmt", "--check"])
+        .assert()
+        .success();
+}
+
 #[test]
 fn license() {
     let re = Regex::new(r"^[^:]*\b(Apache-2.0|BSD-3-Clause|MIT)\b").unwrap();

macro/build.rs

@@ -1,8 +1,8 @@
 fn main() {
     if enabled("CAST_CHECKS_LOG") && cfg!(not(procmacro2_semver_exempt)) {
         println!(
-            "cargo:warning=`CAST_CHECKS_LOG` is enabled, but this option requires \
-             `--cfg procmacro2_semver_exempt` to be passed to rustc"
+            "cargo:warning=`CAST_CHECKS_LOG` is enabled, but this option requires `--cfg \
+             procmacro2_semver_exempt` to be passed to rustc"
         );
     }
 

macro/src/lib.rs

@@ -18,7 +18,7 @@ use syn::{
 /// #[cast_checks::enable]
 /// fn as_u16(x: u64) -> u16 {
 ///     x as u16
-///}
+/// }
 /// ```
 ///
 /// For additional details, see the [repository documentation].

rustfmt.toml

@@ -0,0 +1,3 @@
+comment_width = 100
+format_strings = true
+wrap_comments = true