cargo-gpu merge: fix docs and clippy

Author: Firestar99

crates/cargo-gpu-install/src/install.rs

@@ -80,6 +80,7 @@ pub struct Install {
         clippy::doc_markdown,
         reason = "The URL should appear literally like this. But Clippy wants a markdown clickable link"
     )]
+    #[expect(rustdoc::bare_urls)]
     /// Source of `spirv-builder` dependency
     /// Eg: "https://github.com/Rust-GPU/rust-gpu"
     #[cfg_attr(feature = "clap", clap(long))]

crates/cargo-gpu-install/src/lib.rs

@@ -1,9 +1,5 @@
 #![expect(clippy::pub_use, reason = "pub use for build scripts")]
-#![expect(
-    missing_docs,
-    clippy::missing_docs_in_private_items,
-    reason = "crate docs are cfg'ed out"
-)]
+#![expect(missing_docs, reason = "crate docs are cfg'ed out")]
 #![cfg_attr(doc, doc = include_str!("../README.md"))]
 
 pub mod install;

crates/cargo-gpu-install/src/spirv_source.rs

@@ -15,6 +15,7 @@ use std::path::{Path, PathBuf};
     clippy::doc_markdown,
     reason = "The URL should appear literally like this. But Clippy wants a markdown clickable link"
 )]
+#[expect(rustdoc::bare_urls)]
 /// The source and version of `rust-gpu`.
 /// Eg:
 ///   * From crates.io with version "0.10.0"

crates/cargo-gpu-install/src/test.rs

@@ -39,8 +39,9 @@ impl TestEnv {
     }
 
     /// Copies the `shader_crate_template` to the temp dir and returns the path to the directory.
+    #[expect(clippy::unused_self)]
     pub fn setup_shader_crate(&self) -> anyhow::Result<PathBuf> {
-        let shader_crate_path = crate::cache_dir().unwrap().join("shader_crate");
+        let shader_crate_path = crate::cache_dir()?.join("shader_crate");
         copy_dir_all(shader_crate_template_path(), &shader_crate_path)?;
         Ok(shader_crate_path)
     }
@@ -65,6 +66,12 @@ impl TestEnv {
     }
 }
 
+impl Default for TestEnv {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Drop for TestEnv {
     fn drop(&mut self) {
         TESTDIR.replace(None).unwrap();
@@ -76,14 +83,14 @@ impl Drop for TestEnv {
 }
 
 thread_local! {
-    static TESTDIR: RefCell<Option<PathBuf>> = RefCell::new(None);
+    static TESTDIR: RefCell<Option<PathBuf>> = const { RefCell::new(None) };
 }
 
 /// [`crate::cache_dir`] for testing, see [`TestEnv`]
 pub fn test_cache_dir() -> anyhow::Result<PathBuf> {
-    Ok(TESTDIR.with_borrow(|a| a.clone()).context(
+    TESTDIR.with_borrow(|a| a.clone()).context(
         "TestEnv is not initialized! Add `let _env = TestEnv::new();` to the beginning of your test",
-    )?)
+    )
 }
 
 fn copy_dir_all(