.github/workflows/ci.yml

@@ -9,30 +9,112 @@ env:
   RUSTFLAGS: --deny warnings
   RUSTDOCFLAGS: --deny warnings
 jobs:
-  build-and-test:
+  # Run tests
+  test:
+    name: Tests
     runs-on: ubuntu-latest
-    env:
+    timeout-minutes: 30
-      SCCACHE_GHA_ENABLED: "true"
-      RUSTC_WRAPPER: "sccache"
     steps:
-      - name: Checkout code
+      - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4
-      - name: Install Rust
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends \
+            libasound2-dev libudev-dev libwayland-dev \
+            libxkbcommon-dev
+      - name: Populate target directory from cache
+        uses: Leafwing-Studios/cargo-cache@v2
+        with:
+          sweep-cache: true
+      - name: Install cargo-nextest
+        run: cargo install cargo-nextest --locked
+      - name: Run tests with nextest
+        run: |
+          cargo nextest run \
+            --all-features \
+            --all-targets
+          # Workaround for https://github.com/rust-lang/cargo/issues/6669
+          cargo test \
+            --locked \
+            --workspace \
+            --all-features \
+            --doc
+  # Run clippy lints
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: stable
+          components: clippy
-          components: clippy, rustfmt
+      - name: Install dependencies
-      - name: Run sccache-cache
-        uses: mozilla-actions/sccache-action@v0.0.9
-      - name: Install cargo-nextest
-        uses: taiki-e/install-action@cargo-nextest
-      - name: Run Clippy
-        run: cargo clippy --locked --workspace --all-targets --all-features -- -D warnings
-      - name: Run formatting
-        run: cargo fmt --all --check
-      - name: Run Tests
         run: |
-          cargo nextest run --all-features --all-targets
+          sudo apt-get update
-          cargo test --locked --workspace --all-features --doc
+          sudo apt-get install --no-install-recommends \
-      - name: Check Documentation
+            libasound2-dev libudev-dev libwayland-dev \
-        run: cargo doc --locked --workspace --all-features --document-private-items --no-deps
+            libxkbcommon-dev
+      - name: Populate target directory from cache
+        uses: Leafwing-Studios/cargo-cache@v2
+        with:
+          sweep-cache: true
+      - name: Run clippy lints
+        run: |
+          cargo clippy \
+            --locked \
+            --workspace \
+            --all-features \
+            -- \
+            --deny warnings
+  # Check formatting
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: Run cargo fmt
+        run: |
+          cargo fmt \
+            --all \
+            -- \
+            --check
+  # Check documentation
+  doc:
+    name: Docs
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends \
+            libasound2-dev libudev-dev libwayland-dev \
+            libxkbcommon-dev
+      - name: Populate target directory from cache
+        uses: Leafwing-Studios/cargo-cache@v2
+        with:
+          sweep-cache: true
+      - name: Check documentation
+        run: |
+          cargo doc \
+            --locked \
+            --workspace \
+            --all-features \
+            --document-private-items \
+            --no-deps

.github/workflows/publish.yml

@@ -15,9 +15,10 @@ on:
 jobs:
   audit:
     name: Audit
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
       - uses: actions-rust-lang/audit@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -27,17 +28,11 @@ jobs:
       - audit
     runs-on: ubuntu-latest
     timeout-minutes: 25
-    env:
-      SCCACHE_GHA_ENABLED: "true"
-      RUSTC_WRAPPER: "sccache"
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: stable
+          fetch-depth: 0
-          components: clippy, rustfmt
+      - uses: dtolnay/rust-toolchain@stable
-      - name: Run sccache-cache
-        uses: mozilla-actions/sccache-action@v0.0.9
       - name: cargo-release Cache
         id: cargo_release_cache
         uses: actions/cache@v4
@@ -65,4 +60,11 @@ jobs:
         # to the tag while building, which is a detached head
 
         run: |
-          cargo release publish --workspace --all-features --allow-branch HEAD --no-confirm --no-verify --execute
+          cargo release \
+            publish \
+            --workspace \
+            --all-features \
+            --allow-branch HEAD \
+            --no-confirm \
+            --no-verify \
+            --execute

Cargo.lock

@@ -50,7 +50,7 @@ checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
 [[package]]
 name = "filecaster"
-version = "0.2.3"
+version = "0.2.2"
 dependencies = [
  "filecaster-derive",
  "merge",
@@ -58,12 +58,11 @@ dependencies = [
  "serde_json",
  "tempfile",
  "toml",
- "trybuild",
 ]
 
 [[package]]
 name = "filecaster-derive"
-version = "0.2.3"
+version = "0.2.2"
 dependencies = [
  "claims",
  "filecaster",
@@ -88,12 +87,6 @@ dependencies = [
  "wasi",
 ]
 
-[[package]]
-name = "glob"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
-
 [[package]]
 name = "hashbrown"
 version = "0.15.4"
@@ -288,12 +281,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "target-triple"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ac9aa371f599d22256307c24a9d748c041e548cbf599f35d890f9d365361790"
-
 [[package]]
 name = "tempfile"
 version = "3.20.0"
@@ -307,15 +294,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "termcolor"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "toml"
 version = "0.9.2"
@@ -355,21 +333,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fcc842091f2def52017664b53082ecbbeb5c7731092bad69d2c63050401dfd64"
 
-[[package]]
-name = "trybuild"
-version = "1.0.110"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32e257d7246e7a9fd015fb0b28b330a8d4142151a33f03e6a497754f4b1f6a8e"
-dependencies = [
- "glob",
- "serde",
- "serde_derive",
- "serde_json",
- "target-triple",
- "termcolor",
- "toml",
-]
-
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
@@ -385,15 +348,6 @@ dependencies = [
  "wit-bindgen-rt",
 ]
 
-[[package]]
-name = "winapi-util"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
-dependencies = [
- "windows-sys 0.59.0",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.59.0"

Cargo.toml

@@ -12,7 +12,6 @@ claims = "0.8"
 serde_json = "1.0"
 tempfile = "3.10"
 toml = "0.9"
-trybuild = "1.0"
 
 [workspace.lints.clippy]
 pedantic = "warn"

README.md

@@ -5,7 +5,7 @@ Procedural macro to derive configuration from files, with optional merging capab
 ## Features
 
 - **Derive Configuration:** Easily load configuration from files into your Rust structs.
-- **Default Values:** Specify default values for struct fields using the `#[from_file(default = "...")]` attribute.
+- **Default Values:** Specify default values for struct fields using the `#[default = "..."]` attribute.
 - **Optional Merging:** When the `merge` feature is enabled, allows merging multiple configuration sources.
 
 ## Usage
@@ -18,56 +18,30 @@ filecaster = "0.2"
 ```rust
 use filecaster::FromFile;
 
-#[derive(Debug, Clone, PartialEq, FromFile)]
+#[derive(Debug, Clone, FromFile)]
-struct AppConfig {
+pub struct MyConfig {
-    /// If the user does not specify a host, use `"127.0.0.1"`.
+    #[from_file(default = "localhost")]
-    #[from_file(default = "127.0.0.1")]
+    pub host: String,
-    host: String,
-
-    /// Port number; defaults to `8080`.
     #[from_file(default = 8080)]
-    port: u16,
+    pub port: u16,
-
+    #[from_file(default = false)]
-    /// If not set, use `false`. Requires `bool: Default`.
+    pub enabled: bool,
-    auto_reload: bool,
 }
 
 fn main() {
-    // Simulate file content (e.g., from a JSON file)
+    // Simulate loading from a file (e.g., JSON, YAML, TOML)
-    let file_content = r#"{ "host": "localhost", "port": 3000 }"#;
+    let file_content = r#"
-
+        {
-    // The `AppConfigFile` struct is automatically generated by `#[derive(FromFile)]`.
+            "host": "localhost"
-    // It has all fields as `Option<T>`.
-    let partial_config: AppConfigFile = serde_json::from_str(file_content).unwrap();
-    let partial_config2 = partial_config.clone();
-
-    // Use the generated `from_file` method to get the final config.
-    // Default values are applied for missing fields.
-    let config = AppConfig::from_file(Some(partial_config));
-    // or
-    let config: AppConfig = partial_config2.into();
-
-    assert_eq!(config.host, "localhost");
-    assert_eq!(config.port, 3000);
-    assert_eq!(config.auto_reload, false); // `bool::default()` is `false`
-
-    println!("Final Config: {:#?}", config);
-
-    // Example with no file content (all defaults)
-    let default_config = AppConfig::from_file(None);
-    assert_eq!(default_config.host, "127.0.0.1");
-    assert_eq!(default_config.port, 8080);
-    assert_eq!(default_config.auto_reload, false);
         }
-```
+    "#;
 
-## Examples
+    let config_from_file: MyConfig = serde_json::from_str(file_content).unwrap();
+    let config = MyConfig::from_file(Some(config_from_file));
 
-Use `cargo run --example <example_name>` to execute a specific example. For example:
+    println!("Config: {:?}", config);
-
+    // Expected output: Config { host: "localhost", port: 8080, enabled: false }
-```bash
+}
-cargo run --example simple
-cargo run --example nested
 ```
 
 ## Documentation

filecaster-derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "filecaster-derive"
-version = "0.2.3"
+version = "0.2.2"
 edition = "2024"
 authors = ["Kristofers Solo <dev@kristofers.xyz>"]
 description = "Procedural derive macro for `filecaster`: automatically implement `FromFile` for your structs."

filecaster-derive/src/from_file.rs

@@ -60,14 +60,12 @@ fn extract_named_fields(input: &DeriveInput) -> Result<&FieldsNamed> {
             Fields::Named(fields) => Ok(fields),
             _ => Err(Error::new_spanned(
                 &input.ident,
-                r#"FromFile only works on structs with *named* fields.
+                "FromFile can only be derived for structs with named fields",
-Tuple structs and unit structs are not supported."#,
             )),
         },
         _ => Err(Error::new_spanned(
             &input.ident,
-            r#"FromFile only works on structs.
+            "FromFile can only be derived for structs",
-Enums are not supported."#,
         )),
     }
 }
@@ -174,14 +172,14 @@ fn parse_default(list: &MetaList) -> Result<Option<Expr>> {
             let value = meta.value()?;
             let expr = value.parse::<Expr>()?;
 
-            if let Expr::Lit(expr_lit) = &expr
+            if let Expr::Lit(expr_lit) = &expr {
-                && let Lit::Str(lit_str) = &expr_lit.lit
+                if let Lit::Str(lit_str) = &expr_lit.lit {
-            {
                     default_expr = Some(parse_quote! {
                         #lit_str.to_string()
                     });
                     return Ok(());
                 }
+            }
             default_expr = Some(expr);
         }
         Ok(())

filecaster-derive/src/lib.rs

@@ -34,38 +34,39 @@
 //!
 //! ```rust
 //! use filecaster::FromFile;
+//! use serde::{Deserialize, Serialize};
 //!
-//! #[derive(Debug, Clone, PartialEq, FromFile)]
+//! #[derive(Debug, Clone, PartialEq, FromFile, Serialize, Deserialize)]
 //! struct AppConfig {
 //!     /// If the user does not specify a host, use `"127.0.0.1"`.
 //!     #[from_file(default = "127.0.0.1")]
 //!     host: String,
 //!
-//!     /// Port number; defaults to `8080`.
+//!     /// Number of worker threads; defaults to `4`.
-//!     #[from_file(default = 8080)]
+//!     #[from_file(default = 4)]
-//!     port: u16,
+//!     workers: usize,
 //!
 //!     /// If not set, use `false`. Requires `bool: Default`.
 //!     auto_reload: bool,
 //! }
 //!
-//! fn example() {
+//! fn main() {
 //!     // Simulate file content (e.g., from a JSON file)
-//!     let file_content = r#"{ "host": "localhost", "port": 3000 }"#;
+//!     let file_content = r#"{
+//!         "host": "localhost",
+//!         "workers": 8
+//!     }"#;
 //!
 //!     // The `AppConfigFile` struct is automatically generated by `#[derive(FromFile)]`.
 //!     // It has all fields as `Option<T>`.
 //!     let partial_config: AppConfigFile = serde_json::from_str(file_content).unwrap();
-//!     let partial_config2 = partial_config.clone();
 //!
 //!     // Use the generated `from_file` method to get the final config.
 //!     // Default values are applied for missing fields.
 //!     let config = AppConfig::from_file(Some(partial_config));
-//!     // or
-//!     let config: AppConfig = partial_config2.into();
 //!
 //!     assert_eq!(config.host, "localhost");
-//!     assert_eq!(config.port, 3000);
+//!     assert_eq!(config.workers, 8);
 //!     assert_eq!(config.auto_reload, false); // `Default::default()` for bool is `false`
 //!
 //!     println!("Final Config: {:#?}", config);
@@ -73,7 +74,7 @@
 //!     // Example with no file content (all defaults)
 //!     let default_config = AppConfig::from_file(None);
 //!     assert_eq!(default_config.host, "127.0.0.1");
-//!     assert_eq!(default_config.port, 8080);
+//!     assert_eq!(default_config.workers, 4);
 //!     assert_eq!(default_config.auto_reload, false);
 //! }
 //! ```

filecaster/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "filecaster"
-version = "0.2.3"
+version = "0.2.2"
 edition = "2024"
 authors = ["Kristofers Solo <dev@kristofers.xyz>"]
 description = "Procedural macro to derive configuration from files, with optional merging capabilities."
@@ -28,4 +28,3 @@ merge = { workspace = true, optional = true }
 serde_json.workspace = true
 tempfile.workspace = true
 toml.workspace = true
-trybuild.workspace = true

filecaster/examples/data/nested.json

@@ -1,7 +0,0 @@
-{
-  "key": "json key",
-  "number": 123,
-  "nested": {
-    "inner_number": 42
-  }
-}

filecaster/examples/data/nested.toml

@@ -1,6 +0,0 @@
-key = "toml key"
-number = 456
-
-[nested]
-inner_key = "inner toml key"
-inner_number = 99

filecaster/examples/data/simple.json

@@ -1,4 +0,0 @@
-{
-  "key": "json key",
-  "number": 123
-}

filecaster/examples/data/simple.toml

@@ -1,2 +0,0 @@
-number = 456
-exists = true

filecaster/examples/nested.rs

@@ -1,59 +0,0 @@
-use filecaster::FromFile;
-use std::fs;
-
-#[derive(Debug, FromFile)]
-pub struct InnerData {
-    #[from_file(default = "inner default")]
-    pub inner_key: String,
-    #[from_file(default = 42)]
-    pub inner_number: i32,
-}
-
-#[derive(Debug, FromFile)]
-pub struct MyData {
-    #[from_file(default = "default key")]
-    pub key: String,
-    #[from_file(default = 0)]
-    pub number: i32,
-    pub nested: InnerData,
-}
-
-fn main() {
-    // Get the absolute current directory
-    let current_dir = std::env::current_dir().expect("Failed to get current directory");
-    // Path to the data directory
-    let data_dir = current_dir.join("filecaster/examples/data");
-
-    // Paths to JSON and TOML files
-    let json_path = data_dir.join("nested.json");
-    let toml_path = data_dir.join("nested.toml");
-
-    // Read and parse JSON file
-    let json_content = fs::read_to_string(&json_path)
-        .unwrap_or_else(|e| panic!("Failed to read JSON file at {:?}: {}", json_path, e));
-    let json_data: MyData = serde_json::from_str::<MyDataFile>(&json_content)
-        .unwrap_or_else(|e| panic!("Failed to parse JSON in {:?}: {}", json_path, e))
-        .into();
-
-    // Read and parse TOML file
-    let toml_content = fs::read_to_string(&toml_path)
-        .unwrap_or_else(|e| panic!("Failed to read TOML file at {:?}: {}", toml_path, e));
-    let toml_data: MyData = toml::from_str::<MyDataFile>(&toml_content)
-        .unwrap_or_else(|e| panic!("Failed to parse TOML in {:?}: {}", toml_path, e))
-        .into();
-
-    // Output the parsed data
-    dbg!(&json_data);
-    dbg!(&toml_data);
-
-    // Example assertions (adjust based on your actual file contents)
-    assert_eq!(json_data.key, "json key");
-    assert_eq!(json_data.number, 123);
-    assert_eq!(json_data.nested.inner_key, "inner default");
-    assert_eq!(json_data.nested.inner_number, 42);
-
-    assert_eq!(toml_data.key, "toml key");
-    assert_eq!(toml_data.number, 456);
-    assert_eq!(toml_data.nested.inner_key, "inner toml key");
-    assert_eq!(toml_data.nested.inner_number, 99);
-}

filecaster/examples/simple.rs

@@ -1,48 +0,0 @@
-use filecaster::FromFile;
-use std::fs;
-
-#[derive(Debug, FromFile)]
-pub struct MyData {
-    #[from_file(default = "default key")]
-    pub key: String,
-    pub number: i32,
-    pub exists: bool,
-}
-
-fn main() {
-    // Get the absolute current directory
-    let current_dir = std::env::current_dir().expect("Failed to get current directory");
-    // Path to the data directory
-    let data_dir = current_dir.join("filecaster/examples/data");
-
-    // Paths to JSON and TOML files
-    let json_path = data_dir.join("simple.json");
-    let toml_path = data_dir.join("simple.toml");
-
-    // Read and parse JSON file
-    let json_content = fs::read_to_string(&json_path)
-        .unwrap_or_else(|e| panic!("Failed to read JSON file at {:?}: {}", json_path, e));
-    let json_data: MyData = serde_json::from_str::<MyDataFile>(&json_content)
-        .unwrap_or_else(|e| panic!("Failed to parse JSON in {:?}: {}", json_path, e))
-        .into();
-
-    // Read and parse TOML file
-    let toml_content = fs::read_to_string(&toml_path)
-        .unwrap_or_else(|e| panic!("Failed to read TOML file at {:?}: {}", toml_path, e));
-    let toml_data: MyData = toml::from_str::<MyDataFile>(&toml_content)
-        .unwrap_or_else(|e| panic!("Failed to parse TOML in {:?}: {}", toml_path, e))
-        .into();
-
-    // Output the parsed data
-    dbg!(&json_data);
-    dbg!(&toml_data);
-
-    // Example assertions (adjust based on your actual file contents)
-    assert_eq!(json_data.key, "json key".to_string());
-    assert_eq!(json_data.number, 123);
-    assert!(!json_data.exists); // `bool::default()` is `false`
-
-    assert_eq!(toml_data.key, "default key".to_string());
-    assert_eq!(toml_data.number, 456);
-    assert!(toml_data.exists);
-}

filecaster/src/lib.rs

@@ -40,7 +40,7 @@
 //! struct AppConfig {
 //!     host: String,
 //!     port: u16,
-//!     auto_reload: bool,
+//!     enabled: bool,
 //! }
 //!
 //! // The `Shadow` type is automatically generated by `filecaster-derive`
@@ -49,7 +49,7 @@
 //! struct AppConfigFile {
 //!     host: Option<String>,
 //!     port: Option<u16>,
-//!     auto_reload: Option<bool>,
+//!     enabled: Option<bool>,
 //! }
 //!
 //! // The `FromFile` implementation is also automatically generated.
@@ -62,12 +62,12 @@
 //!         AppConfig {
 //!             host: file.host.unwrap_or_else(|| "127.0.0.1".to_string()),
 //!             port: file.port.unwrap_or(8080),
-//!             auto_reload: file.auto_reload.unwrap_or(true),
+//!             enabled: file.enabled.unwrap_or(true),
 //!         }
 //!     }
 //! }
 //!
-//! fn example() {
+//! fn main() {
 //!     // Simulate deserializing from a file
 //!     let file_content = r#"{ "host": "localhost", "port": 3000 }"#;
 //!     let partial_config: AppConfigFile = serde_json::from_str(file_content).unwrap();
@@ -77,15 +77,9 @@
 //!
 //!     assert_eq!(config.host, "localhost");
 //!     assert_eq!(config.port, 3000);
-//!     assert_eq!(config.auto_reload, false); // `Default::default()` for bool is `false`
+//!     assert_eq!(config.enabled, true); // Default value applied
 //!
-//!     println!("Final Config: {:#?}", config);
+//!     println!("Final Config: {:?}", config);
-//!
-//!     // Example with no file content (all defaults)
-//!     let default_config = AppConfig::from_file(None);
-//!     assert_eq!(default_config.host, "127.0.0.1");
-//!     assert_eq!(default_config.port, 8080);
-//!     assert_eq!(default_config.auto_reload, false);
 //! }
 //! ```
 //!

filecaster/tests/ui.rs

@@ -1,7 +0,0 @@
-use trybuild::TestCases;
-
-#[test]
-fn ui() {
-    let t = TestCases::new();
-    t.compile_fail("tests/ui/*.rs");
-}

filecaster/tests/ui/enum_not_supported.rs

@@ -1,9 +0,0 @@
-use filecaster::FromFile;
-
-#[derive(FromFile)]
-enum MyEnum {
-    A,
-    B,
-}
-
-fn main() {}

filecaster/tests/ui/enum_not_supported.stderr

@@ -1,6 +0,0 @@
-error: FromFile only works on structs.
-       Enums are not supported.
- --> tests/ui/enum_not_supported.rs:4:6
-  |
-4 | enum MyEnum {
-  |      ^^^^^^

filecaster/tests/ui/tuple_struct_not_supported.rs

@@ -1,6 +0,0 @@
-use filecaster::FromFile;
-
-#[derive(FromFile)]
-struct MyTuple(i32, String);
-
-fn main() {}

filecaster/tests/ui/tuple_struct_not_supported.stderr

@@ -1,6 +0,0 @@
-error: FromFile only works on structs with *named* fields.
-       Tuple structs and unit structs are not supported.
- --> tests/ui/tuple_struct_not_supported.rs:4:8
-  |
-4 | struct MyTuple(i32, String);
-  |        ^^^^^^^