Fix lint errors in newer Rust

Cargo.toml

@@ -13,6 +13,7 @@ unused_crate_dependencies = "warn"
 
 [workspace.lints.clippy]
 panic_in_result_fn = "warn"
-pedantic = "warn"
+# The explicit priority is required due to https://github.com/rust-lang/cargo/issues/13565.
+pedantic = { level = "warn", priority = -1 }
 unwrap_used = "warn"
 module_name_repetitions = "allow"

commons/src/cache/app_cache.rs

@@ -83,9 +83,9 @@ impl AppCache {
     /// # Errors
     ///
     /// - If the cache or applications directory cannot be created
-    /// (possibly due to permissions error).
+    ///   (possibly due to permissions error).
     /// - If files from the cache cannot be loaded into the
-    /// application directory (possibly due to permissions error).
+    ///   application directory (possibly due to permissions error).
     /// - Internal errors from libcnb layer creation and execution.
     pub fn new_and_load<B: libcnb::Buildpack>(
         context: &BuildContext<B>,
@@ -124,7 +124,7 @@ impl AppCache {
     /// # Errors
     ///
     /// - If the files cannot be moved/coppied into the cache
-    /// then then an error will be raised.
+    ///   then then an error will be raised.
     pub fn save(&self) -> Result<&AppCache, CacheError> {
         match self.keep_path {
             KeepPath::Runtime => preserve_path_save(self)?,
@@ -143,7 +143,7 @@ impl AppCache {
     /// # Errors
     ///
     /// - If files cannot be moved from the cache to the path
-    /// then an error will be raised.
+    ///   then an error will be raised.
     pub fn load(&self) -> Result<&Self, CacheError> {
         fs_err::create_dir_all(&self.path).map_err(CacheError::IoError)?;
         fs_err::create_dir_all(&self.cache).map_err(CacheError::IoError)?;
@@ -186,7 +186,7 @@ impl AppCache {
     ///
     /// - If files cannot be deleted an error will be raised
     /// - If the operating system does not support the `mtime` an
-    /// error will be raised.
+    ///   error will be raised.
     /// - If metadata of a file cannot be read, an error will be raised
     pub fn save_and_clean(&self) -> Result<Option<FilesWithSize>, CacheError> {
         self.save()?;

commons/src/cache/clean.rs

@@ -15,7 +15,7 @@ use std::time::SystemTime;
 ///
 /// - The provided ``cache_path`` is not valid UTF-8 (`OsStringErr`).
 /// - Metadata from a file in the ``cache_path`` cannot be retrieved from the OS (`IoError`).
-/// this is needed for mtime retrieval to calculate which file is least recently used.
+///   this is needed for mtime retrieval to calculate which file is least recently used.
 /// - If there's an OS error while deleting a file.
 /// - If an internal glob pattern is incorrect
 /// - If the OS does not support mtime operation on files.

commons/src/output/section_log.rs

@@ -13,9 +13,9 @@ use std::marker::PhantomData;
 /// only downside is that the buildpack author (you) is now responsible for:
 ///
 /// - Ensuring that `Box<dyn StartedLogger>::section()` was called right before any of these
-/// functions are called.
+///   functions are called.
 /// - Ensuring that you are not attempting to log while already logging i.e. calling `step()` within a
-/// `step_timed()` call.
+///   `step_timed()` call.
 ///
 /// For usage details run `cargo run --bin print_style_guide`
 ///