fix(misc): Improve ci and fix clippy (#290)

* ci: Update actions, replace actions-rs.

* `actions/checkout` is updated from `v1` to the current `v4`.
* `actions-rs/toolchain` is replaced by `dtolnay/rust-toolchain` as
  the `actions-rs` actions haven't been maintained in a long time.

* clippy: Remove unnecessary call to `into_iter`.

The parameter takes `IntoIterator`, so we don't have to call
`into_iter` at the call site.

* clippy: Remove explicit lifetime that can be elided.

* clippy: tests: Fix useless conversion warnings.

* clippy: tests: Remove call to `format!`.

* Fix minimal-versions build.

Due to changes in the nightly compiler, using a recent nightly
requires proc-macro2 1.0.60 or later:

https://github.com/dtolnay/proc-macro2/issues/356

* ci: Use is-terminal 0.4.7 for MSRV builds.

is-terminal 0.4.8 updated its MSRV to 1.63, so we can't use it
with our MSRV of 1.56. Force usage of the older version which has
an older MSRV.

.github/workflows/ci.yml

@@ -10,14 +10,12 @@ jobs:
     name: Check fmt & build docs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: stable
           components: rustfmt
-          override: true
       - name: rustfmt
         run: cargo fmt --all -- --check
       - name: docs
@@ -32,14 +30,15 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: ${{ matrix.rust }}
           components: clippy
-          override: true
+      - name: Force older version of is-terminal for MSRV builds
+        if: matrix.rust == '1.56.0'
+        run:  cargo update -p is-terminal --precise 0.4.7
       - name: Clippy
         run: cargo clippy --all -- -D warnings
       - name: Run tests
@@ -54,14 +53,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: nightly
           components: miri,rust-src
-          override: true
       - name: Run tests with miri
         env:
           MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-strict-provenance
@@ -75,13 +72,11 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-          profile: minimal
           toolchain: nightly
-          override: true
       - name: Run minimal version build
         run: cargo build -Z minimal-versions --all-features
 

miette-derive/Cargo.toml

@@ -11,6 +11,6 @@ repository = "https://github.com/zkat/miette"
 proc-macro = true
 
 [dependencies]
-proc-macro2 = "1.0"
+proc-macro2 = "1.0.60"
 quote = "1.0"
 syn = "2.0.11"

src/handlers/graphical.rs

@@ -382,10 +382,10 @@ impl GraphicalReportHandler {
         Ok(())
     }
 
-    fn render_context<'a>(
+    fn render_context(
         &self,
         f: &mut impl fmt::Write,
-        source: &'a dyn SourceCode,
+        source: &dyn SourceCode,
         context: &LabeledSpan,
         labels: &[LabeledSpan],
     ) -> fmt::Result {

src/miette_diagnostic.rs

@@ -252,7 +252,7 @@ impl MietteDiagnostic {
     /// ```
     pub fn and_labels(mut self, labels: impl IntoIterator<Item = LabeledSpan>) -> Self {
         let mut all_labels = self.labels.unwrap_or_default();
-        all_labels.extend(labels.into_iter());
+        all_labels.extend(labels);
         self.labels = Some(all_labels);
         self
     }

tests/derive.rs

@@ -189,7 +189,7 @@ fn fmt_help() {
 
     assert_eq!(
         "1 x hello x \"2\"".to_string(),
-        FooStruct("hello".into()).help().unwrap().to_string()
+        FooStruct("hello").help().unwrap().to_string()
     );
 
     #[derive(Debug, Diagnostic, Error)]
@@ -201,12 +201,7 @@ fn fmt_help() {
 
     assert_eq!(
         "1 x hello x \"2\"".to_string(),
-        BarStruct {
+        BarStruct { my_field: "hello" }.help().unwrap().to_string()
-            my_field: "hello".into()
-        }
-        .help()
-        .unwrap()
-        .to_string()
     );
 
     #[derive(Debug, Diagnostic, Error)]
@@ -224,7 +219,7 @@ fn fmt_help() {
 
     assert_eq!(
         "1 x bar x \"2\"".to_string(),
-        FooEnum::X("bar".into()).help().unwrap().to_string()
+        FooEnum::X("bar").help().unwrap().to_string()
     );
 
     assert_eq!(
@@ -250,12 +245,7 @@ fn help_field() {
 
     assert_eq!(
         "x".to_string(),
-        Foo {
+        Foo { do_this: Some("x") }.help().unwrap().to_string()
-            do_this: Some("x".into())
-        }
-        .help()
-        .unwrap()
-        .to_string()
     );
 
     #[derive(Debug, Diagnostic, Error)]
@@ -271,16 +261,11 @@ fn help_field() {
 
     assert_eq!(
         "x".to_string(),
-        Bar::A(Some("x".into())).help().unwrap().to_string()
+        Bar::A(Some("x")).help().unwrap().to_string()
     );
     assert_eq!(
         "x".to_string(),
-        Bar::B {
+        Bar::B { do_this: Some("x") }.help().unwrap().to_string()
-            do_this: Some("x".into())
-        }
-        .help()
-        .unwrap()
-        .to_string()
     );
 
     #[derive(Debug, Diagnostic, Error)]
@@ -288,20 +273,14 @@ fn help_field() {
     #[diagnostic()]
     struct Baz<'a>(#[help] Option<&'a str>);
 
-    assert_eq!(
+    assert_eq!("x".to_string(), Baz(Some("x")).help().unwrap().to_string());
-        "x".to_string(),
-        Baz(Some("x".into())).help().unwrap().to_string()
-    );
 
     #[derive(Debug, Diagnostic, Error)]
     #[error("welp")]
     #[diagnostic()]
     struct Quux<'a>(#[help] &'a str);
 
-    assert_eq!(
+    assert_eq!("x".to_string(), Quux("x").help().unwrap().to_string());
-        "x".to_string(),
-        Quux("x".into()).help().unwrap().to_string()
-    );
 }
 
 #[test]

tests/test_diagnostic_source_macro.rs

@@ -79,7 +79,7 @@ fn test_diagnostic_source() {
 fn test_diagnostic_source_pass_extra_info() {
     let diag = TestBoxedError(Box::new(SourceError {
         code: String::from("Hello\nWorld!"),
-        help: format!("Have you tried turning it on and off again?"),
+        help: String::from("Have you tried turning it on and off again?"),
         label: (1, 4),
     }));
     let mut out = String::new();

tests/test_json.rs

@@ -52,7 +52,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -98,7 +97,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -144,7 +142,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -190,7 +187,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -235,7 +231,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -281,7 +276,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -347,7 +341,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -393,7 +386,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -456,7 +448,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -532,7 +523,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -588,7 +578,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -644,7 +633,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -700,7 +688,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -728,7 +715,6 @@ mod json_report_handler {
             "related": []
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -822,7 +808,6 @@ mod json_report_handler {
             }]
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);
@@ -920,7 +905,6 @@ mod json_report_handler {
             }]
         }"#
         .lines()
-        .into_iter()
         .map(|s| s.trim_matches(|c| c == ' ' || c == '\n'))
         .collect();
         assert_eq!(expected, out);