Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@bindings/node/src/lib.rs`:
- Around line 6-13: The exported N-API function main was made synchronous (pub
fn main) but the TypeScript declaration and tests still expect a Promise and a
numeric return, and the tokio runtime build uses .unwrap() which can panic; fix
by either reverting main to an async function (pub async fn main) so napi-rs
will return a Promise and preserve the existing index.d.ts/test expectations, or
if you intend main to be synchronous keep pub fn main but regenerate
bindings/node/index.d.ts to remove the Promise and adjust the test to expect the
synchronous void/number contract; in both cases replace the .unwrap() on
tokio::runtime::Builder::new_multi_thread().build() with proper error handling
(map the build error into Error::new(Status::GenericFailure, ... ) or propagate
it) and ensure run_main(args) is invoked consistently (await when async,
block_on when keeping sync) so the Rust signature, JS declaration, and tests are
aligned.

In `@bindings/python/Cargo.toml`:
- Line 20: The pyo3 dependency declaration currently sets features =
["abi3-py39"] which overrides workspace defaults and drops the required
extension-module feature; update the pyo3 entry in bindings/python/Cargo.toml so
its features include both "abi3-py39" and "extension-module" (i.e., add
"extension-module" alongside the existing "abi3-py39") to ensure the
extension-module workspace feature is not lost.

In `@Cargo.toml`:
- Line 31: The workspace currently builds reqwest without any TLS backend but
publicly exports the rest_api module which requires reqwest::Client for HTTPS;
fix this by adding an explicit library TLS feature and gating rest_api behind
it: add a new feature (e.g., "tls") in Cargo.toml that enables reqwest with
native-tls (adjust the reqwest dependency entry to include feature =
["native-tls", "http2", "charset"] under that feature), remove implicit reliance
on the existing "bin" feature for TLS, and wrap the public export of the
rest_api module (e.g., the pub mod rest_api declaration in lib.rs) with
#[cfg(feature = "tls")] so consumers must opt in to TLS support; alternatively,
if you prefer TLS always available, make the library default feature include
"tls" instead of tying it to "bin".

In `@clang-installer/src/downloader/hashing.rs`:
- Around line 37-42: The read loops currently use "while let Ok(bytes_read) =
file_reader.read(&mut buf)" which swallows I/O errors and leads to partial-hash
finalization; change each loop (the three branches using file_reader.read +
hasher.update + hasher.finalize) to explicitly propagate read errors instead of
silently breaking — e.g. replace the while-let with a loop that calls
file_reader.read(&mut buf) and uses the ? operator (or maps Err to
DownloadError::IoError) to return on error, breaking only on bytes_read == 0,
then call hasher.update for the bytes read; apply this change to all three
branches that compute the hash so real I/O errors are returned rather than
producing HashMismatch.

In `@clang-installer/src/downloader/mod.rs`:
- Around line 42-49: The code currently opens and truncates cache_path
(cache_file) before the download is verified, risking partial/corrupt cache
entries; change the logic to create and write to a temporary file in the same
directory (using cache_parent and a unique temp name, e.g.,
cache_path.with_extension(".partial") or using a random suffix), write the
downloaded body into that temp file (use OpenOptions as before), flush/fsync the
temp file and its parent directory, then atomically rename (std::fs::rename) the
temp file to cache_path only on successful completion; ensure error paths remove
the temp file and do not touch cache_path. Use the existing cache_parent,
cache_path, and cache_file identifiers to locate the change.

In `@clang-installer/src/downloader/native_packages/mod.rs`:
- Around line 90-97: The code currently trusts
mgr.is_installed_package(&pkg_name, Some(min_version)) and returns the found
ClangVersion immediately; instead, after calling tool.get_exe_path(...) and
tool.capture_version(...) you must validate that the captured version satisfies
the original RequestedVersion/version_req (not just min_version) before
returning. In practice, in the block containing is_installed_package, call
capture_version, check the captured version against version_req (or the
exact/upper-bound requirement represented by RequestedVersion::Requirement), and
only construct and return ClangVersion when that check passes; if it does not,
log a mismatch (including tool, mgr, version and version_req) and continue so
the installer can try other resolution paths.

In `@clang-installer/src/downloader/native_packages/unix.rs`:
- Around line 115-139: The package install logic incorrectly runs Homebrew under
sudo and uses pacman's -y flag; update the UnixPackageManager match so PacMan
uses ["-S", "--noconfirm"] instead of ["-S", "-y"], and change the Command
creation so Homebrew is never prefixed with sudo (i.e., if self ==
UnixPackageManager::Homebrew call Command::new(self.as_str()) regardless of
Self::has_sudo()). Keep the existing has_sudo() behavior for other managers and
ensure package_id and args are passed the same way.
- Around line 176-179: The check for DNF packages in UnixPackageManager::Dnf
uses `dnf list <package>` which returns success for packages available in
repositories (not only installed); update the logic in the
is_installed_package() branch handling UnixPackageManager::Dnf to run `dnf list
installed <package>` (i.e., add the "installed" subcommand) and base the success
decision on that command's exit status so only packages present in the RPMDB are
considered installed.

In `@clang-installer/src/downloader/native_packages/windows.rs`:
- Around line 71-83: The package table parsing uses split(' ') which preserves
empty fields from padded columns and breaks lookups; in the Chocolatey parsing
change the iterator creation (the variable l produced by line.split(' ')) to use
split_whitespace() instead, and in the Winget parsing replace split(' ').skip(1)
with split_whitespace().skip(1) so tokenization ignores padding when matching
package_name and extracting version strings (refer to the iterator variable l
and the Version::parse call to verify correct token positions).

In `@clang-installer/src/downloader/pypi.rs`:
- Around line 423-448: The extracted binary is being cached/placed only by major
version (bin_name uses ver.major) while the wheel cache uses the full ver, which
can cause incorrect reuse; change the extracted path/name so it includes the
full version (use ver or ver.to_string() instead of ver.major) when building
bin_name and extracted_bin before calling Self::extract_bin(clang_tool,
&cached_wheel, &extracted_bin) so each full-version wheel produces a distinct
extracted executable; if you still want a major-version alias (e.g.,
clang-format-17) create or update that separate symlink/alias after extracting
the fully-versioned binary rather than replacing the extracted file.
- Around line 435-438: The code currently skips integrity checks when
info.digests.first() is None; change the logic in the function that handles PyPI
metadata (the block using info.digests.first() and digest.verify(&cached_wheel))
to fail closed: if info.digests.first() returns None, return an error (or
propagate a VerificationMissing error) instead of proceeding, and only call
digest.verify(&cached_wheel) when a digest is present; update any surrounding
error types/context to provide a clear message that no supported digest was
present for the wheel.
- Around line 171-189: The macOS branch in is_compatible_with_system currently
requires exact arch string matches and thus rejects universal2 wheels; update
the macos handling in is_compatible_with_system so that when
std::env::consts::OS == "macos" it treats self.arch == "universal2" as
compatible for both sys_arch "x86_64" and "aarch64" (in addition to the existing
exact matches), i.e., accept universal2 for both Intel and Apple Silicon while
preserving the existing exact checks for "x86_64" and "arm64".

In `@clang-installer/src/progress_bar.rs`:
- Line 1: The progress bar checks terminal status using stdin rather than
stdout, so carriage-return redraws can be written to a redirected stdout; update
the terminal check to use stdout().is_terminal() everywhere it's used (e.g.,
where is_interactive is computed and the checks around lines 51-52) so the
progress bar only enables interactive redraws when stdout is a terminal; adjust
any imports/usages from stdin to stdout accordingly and ensure Write/Result
types still compile.

In `@clang-installer/src/version.rs`:
- Around line 301-304: Save the previous CPP_LINTER_CACHE environment value with
std::env::var_os before calling TempDir::new(), set CPP_LINTER_CACHE to
tmp_cache_dir.path() via std::env::set_var, and ensure you restore the original
value (with std::env::set_var if Some or std::env::remove_var if None) in a
drop/guard placed before tmp_cache_dir is dropped so the process-global state is
restored during test teardown; reference the TempDir::new(), std::env::set_var,
and std::env::var_os/remove_var calls to locate where to add the
save-and-restore guard.
- Around line 331-347: The test function eval_version currently runs by default
and can perform global installs; change it to be gated behind an explicit opt-in
by either marking it with #[ignore] or checking a CI-only env var (e.g.,
CLANG_INSTALL_TEST) at the start of eval_version and early-return when not set.
Locate the async test function named eval_version (and the use of
RequestedVersion::Requirement.eval_tool) and add the guard so the potentially
dangerous installation code only executes when the env flag is present or when
the test is run with --ignored in CI.
- Around line 137-168: After a successful download (from
PyPiDownloader::download_tool or StaticDistDownloader::download_tool) capture
the actual version via tool.capture_version(&bin) and verify it satisfies the
original version_req before creating the symlink and returning ClangVersion; if
the captured version does not meet version_req, do not symlink — either attempt
the next fallback (e.g., continue to other download methods or
try_install_package) or return Err(GetToolError::NotFound). Update the logic
around where bin is obtained and before tool.symlink_bin(&bin, &symlink_path,
overwrite_symlink) to perform this check and handle failures accordingly.

In `@clang-installer/tests/pypi.rs`:
- Around line 13-17: The test is unsafely modifying process-global state via
env::set_var("CPP_LINTER_CACHE", ...) which races when tests run in parallel;
instead, remove the unsafe env::set_var usage in tests/pypi.rs (where
tmp_cache_dir is created in the setup()/test) and either (A) change the
downloader API call in the test to accept tmp_cache_dir.path() explicitly (pass
the cache dir into the function that downloads/pulls from PyPI rather than
relying on CPP_LINTER_CACHE), or (B) mark the affected tests to run serially via
nextest test-group config; reference the tmp_cache_dir variable, the
env::set_var call, and the setup()/downloader invocation to locate the change.

In `@clang-installer/tests/static_dist.rs`:
- Around line 12-16: The tests download_clang_format_17 and
download_clang_format_12_0_1 race by mutating the global env var
CPP_LINTER_CACHE via env::set_var around TempDir::new; fix by applying the same
solution used in pypi.rs — either group these tests under a serial test group
(so they don't run in parallel) or change the API to accept a cache directory
parameter and pass tmp_cache_dir.path() directly instead of setting
CPP_LINTER_CACHE; update the test(s) referencing TempDir::new and remove the
unsafe env::set_var usage, or wrap the tests in a serial test annotation to
ensure isolated execution.

In `@cpp-linter/src/run.rs`:
- Line 6: The feature-gate on run.rs prevents integration tests from importing
run::run_main; remove or change it so tests compile: either remove the
crate-level attribute #![cfg(feature = "bin")] from run.rs (so the module and
function run_main are always compiled), or keep the gate and add
required-features = ["bin"] to the test target in Cargo.toml for
tests/comments.rs, or refactor tests to import a non-gated public entrypoint
instead of run::run_main; ensure you reference the run.rs module and the
run_main symbol when applying the chosen fix.

---

Outside diff comments:
In `@cpp-linter/src/cli/structs.rs`:
- Around line 246-289: The failing compile is caused by using Clap-only symbols
when the "bin" feature is disabled; wrap the Clap-dependent import and tests
with the feature gate: move or annotate use super::{Cli, LinesChangedOnly,
ThreadComments} so that Cli is only imported under #[cfg(feature = "bin")] and
add #[cfg(feature = "bin")] to the parse_positional,
display_lines_changed_only_enum, and display_thread_comments_enum tests (or
alternatively gate the entire test module with #[cfg(feature = "bin")]) so that
LinesChangedOnly::from_str and ThreadComments::from_str are only referenced when
the "bin" feature is enabled.

In `@cpp-linter/src/rest_api/mod.rs`:
- Around line 146-165: The make_format_comment and make_tidy_comment calls are
passing the swapped version fields; change the arguments so make_format_comment
receives clang_versions.format_version.as_ref().unwrap().to_string() and
make_tidy_comment receives
clang_versions.tidy_version.as_ref().unwrap().to_string(), keeping the other
parameters (files, &mut comment, *_checks_failed, &mut remaining_length)
unchanged so the correct tool versions are shown.

---

Minor comments:
In @.github/workflows/run-dev-tests.yml:
- Around line 107-117: The CI is running eval_version tests twice because the
"ci" profile's default-filter still includes eval_version; update the "ci"
profile's default-filter (the default-filter setting for the ci profile) to
exclude eval_version tests by replacing the inclusion of test(#*eval_version)
with an exclusion (- test(#*eval_version)), matching how the "all" profile
intentionally excludes them so warmup + ci do not duplicate eval_version runs.

In `@cpp-linter/src/logger.rs`:
- Line 2: The lib export for the logger module is unconditional while the module
file itself is gated with #![cfg(feature = "bin")]; update the module export so
it is also feature-gated by changing the `pub mod logger;` export to be
annotated with the same cfg (i.e., add `#[cfg(feature = "bin")]` before the `pub
mod logger;`) so the compiler only exports the logger when the `bin` feature is
enabled.

---

Nitpick comments:
In @.github/workflows/run-dev-tests.yml:
- Line 34: The matrix OS entries under the "os" key are inconsistently quoted;
update the matrix so both entries use the same quoting style (either both quoted
or both unquoted) for consistency and readability—locate the "os" matrix line in
the workflow (os: ["windows-latest", ubuntu-latest]) and make the two entries
uniform, e.g., change ubuntu-latest to "ubuntu-latest" to match
"windows-latest".

In `@clang-installer/Cargo.toml`:
- Around line 21-38: Add an inline comment in Cargo.toml next to the blake2 =
"0.10.6" and sha2 = "0.10.9" dependency entries explaining that these crypto
crates are intentionally pinned locally (not in workspace.dependencies) for
cryptographic stability/security and to avoid accidental upgrades that could
change hashing outputs or break binary compatibility; reference the blake2 and
sha2 lines so maintainers understand the deliberate pinning and know not to move
them to workspace.dependencies without review.

In `@clang-installer/README.md`:
- Around line 5-7: Replace the awkward sentence "This is a utility for
cpp-linter CLI, thus its API is considered internal to cpp-linter crate." with a
tighter phrasing such as: "This utility is used by the cpp-linter CLI, and its
API is internal to the `cpp-linter` crate." Update the README.md sentence to
match that suggested wording for clarity and grammar.

In `@clang-installer/src/downloader/caching.rs`:
- Around line 29-43: StaticDistDownloader currently bypasses the shared cache
validation logic by directly calling .exists() on the cache file; update
StaticDistDownloader (the code in StaticDistDownloader::... where it checks
cache_file.exists()) to call the shared helper is_cache_valid(cache_file,
max_age) instead so it honors the same max_age/eviction semantics as
is_cache_valid; ensure you pass the same max_age used elsewhere and remove the
direct .exists() check so future cache policy changes apply consistently.

In `@clang-installer/src/main.rs`:
- Around line 120-122: Add a clap value parser for the `directory` argument that
accepts non-existent paths and existing directories but rejects existing files;
implement a function like `validate_install_dir` (signature returning
Result<PathBuf, String> or implementing TypedValueParser) which converts the
input to a PathBuf, returns Ok for paths that don't exist or that are
directories, and returns Err with a clear message when the path exists and is a
file, then attach it to the `pub directory: Option<PathBuf>` arg via the
`#[arg(value_parser = validate_install_dir)]` attribute so validation happens in
the CLI layer instead of later in downloader/tool lookup code.

In `@clang-installer/src/tool.rs`:
- Around line 185-191: The current code uses fs::read_link(symlink_path) and
logs the link but doesn't verify the link's target exists or is accessible;
update the logic around symlink_path and the symlink variable to resolve the
final target (e.g., join symlink_path.parent() with symlink) and then call
fs::metadata or Path::exists on that resolved target to ensure the file exists
(and optionally is executable) before proceeding; keep the existing log but add
an error path that handles broken symlinks when fs::metadata(target) fails.

In `@clang-installer/tests/pypi.rs`:
- Around line 45-48: The test currently hides assertions inside setup(), so
update the code so setup() only performs initialization and move the assertions
into the test function download_clang_format; locate the async fn setup() and
remove any assert!/assert_eq!/expect calls from it, then call setup().await
inside download_clang_format and add the relevant assertions there (or split
setup into setup() and verify_* helpers if preferred) so the test function
explicitly contains the verification logic.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@clang-installer/src/downloader/native_packages/windows.rs`:
- Around line 107-124: The winget parsing loop incorrectly skips an extra token
before reading the version: in the for loop where lines are split into l
(split_ascii_whitespace().skip(1)) and you check package_name, remove the extra
l.next() that skips the version; instead after confirming name == package_name
and consuming the id via l.next() for the id check, directly call l.next() once
to get ver_str and parse it with Version::parse (used with
ver_cmp.matches(&ver)); update the logic around ver_cmp.clone() / Version::parse
usage so the version token is read immediately after the id-consumption and
treat missing/invalid version as not installed as before.

In `@clang-installer/src/progress_bar.rs`:
- Around line 63-64: The inc method and the step-calculation code must be
hardened: in ProgressBar::inc use checked_add or saturating_add to update
self.current and then clamp self.current to at most self.total to avoid overflow
and runaway values; when computing ratios (current/total) treat total == 0
specially (e.g., treat total as 1 or mark complete) and compute a bounded ratio
in [0.0,1.0]; compute new_steps = (ratio * max_steps) but then cap new_steps to
a reasonable range (e.g., 0..=max_steps) before entering the render loops so the
loops at the locations that use new_steps (the bodies referenced around the
render loops at Line 91 and Line 106) cannot iterate extremely many times. Apply
these same clamping/guard patterns to all places that use total, current, ratio,
or new_steps so the progress bar cannot drive pathological render loops.

In `@clang-installer/src/version.rs`:
- Around line 117-135: The cache lookup builds cached_bin using
get_min_ver(version_req) which yields a full semver (e.g., "12.0.0") but
PyPI-stored binaries use a major-only name (see pypi.rs around the PyPI download
naming), so the code in the StaticDistDownloader::get_cache_dir() -> join("bin")
path misses PyPI entries; update the lookup in the function that builds
cached_bin to also try the major-only variant (e.g., format
"{tool}-{min_ver.major}{bin_ext}") or normalize both producers to the same
filename scheme, attempt both candidate paths, and when a candidate exists call
tool.capture_version(&candidate) and validate with version_req.matches(&version)
before returning the ClangVersion with the matched path.

---

Duplicate comments:
In `@bindings/node/index.d.ts`:
- Line 3: The test expects a numeric return but the TypeScript binding now
declares main(args: string[]) => void; update the test in
bindings/node/__test__/index.spec.mjs to use a no-throw assertion instead of
asserting await main(...) === 0 — call main([...]) synchronously (or without
awaiting) and assert it does not throw (e.g., wrap in try/catch or use your test
framework’s doesNotThrow/doesNotReject equivalent), keeping the declaration in
bindings/node/index.d.ts as export declare function main(args: Array<string>):
void.

---

Nitpick comments:
In `@clang-installer/src/downloader/native_packages/windows.rs`:
- Around line 167-168: The code currently creates a top-level let mut cmd =
Command::new(self.as_str()) and then shadows it with let mut cmd =
Command::new("winget") inside the Self::Winget match arm; remove the redundant
top-level creation and instead instantiate Command::new(...) inside each match
arm (e.g., use Command::new(self.as_str()) in the arms that need it and
Command::new("winget") inside the Self::Winget arm) so the variable cmd is only
declared once per arm and there is no shadowing of cmd or unused bindings.

In `@clang-installer/src/progress_bar.rs`:
- Around line 68-72: The progress line can remain unterminated if callers return
early and never call ProgressBar::finish, so add a best-effort Drop
implementation for the ProgressBar type that ensures the line is terminated and
flushed: add a finished: bool field to the ProgressBar struct, set finished =
true inside finish(&mut self) after the writeln!/flush succeed, and implement
Drop for ProgressBar to check finished and if false perform a safe writeln! to
stdout_handle and a flush, swallowing/ignoring any errors (don't panic) to avoid
noisy logs on error paths; reference ProgressBar, finish, stdout_handle, and the
new finished flag when making the changes.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@clang-installer/src/progress_bar.rs`:
- Around line 66-68: The inc method in ProgressBar incorrectly doubles current
by doing self.current += self.current.saturating_add(delta);; change it to add
only delta using saturating_add (e.g., assign self.current =
self.current.saturating_add(delta) or use self.current =
self.current.saturating_add(delta);) so ProgressBar::inc updates linearly, then
call self.render() as before; update the implementation inside the inc(&mut
self, delta: u64) -> Result<()> function.
- Around line 117-142: The else branch currently treats both "advance_bar is
None" (unknown total) and "advance_bar is Some(new_steps) but new_steps <=
self.steps" the same, causing unwanted increments when total is known but
progress didn't advance; update the logic around advance_bar/self.total in the
progress update function so that: if advance_bar is None (unknown total) then
increment self.steps and render the bar as before, but if advance_bar is
Some(new_steps) and new_steps <= self.steps do nothing (no increment, no
write/flush); only render/increment for the known-total case when new_steps >
self.steps. Adjust control flow around the symbols advance_bar, self.total,
self.steps, is_interactive, stdout_handle, LOG_INDENT, BAR_CHAR and prompt to
reflect this separation.

---

Nitpick comments:
In `@clang-installer/src/downloader/mod.rs`:
- Around line 83-96: The function chmod_file currently opens the file with
fs::OpenOptions::new().write(true).open(path) just to read metadata and change
permissions; remove that unnecessary open and instead use path.metadata() (or
fs::metadata(path)) to read current permissions and fs::set_permissions(path,
perms) to write them. Keep the same logic using
std::os::unix::fs::PermissionsExt to compute new mode (use perms.mode(),
set_mode(prev | mode) or default 0o755) but replace references to out.metadata()
and out.set_permissions(...) with metadata() and fs::set_permissions(path,
perms) so the file is not opened for writing.

In `@clang-installer/src/downloader/native_packages/windows.rs`:
- Around line 42-47: The is_installed() method currently treats any spawned
process as success because it uses Command::output().is_ok(); change it to
capture the process result (e.g., let out =
Command::new(self.as_str()).arg("--version").output()) and return whether the
process exited successfully by checking out.status.success() (or use
Command::status() and map(|s| s.success())). Update the is_installed() function
to return that boolean instead of .is_ok().
- Around line 165-173: The Winget branch shadows the earlier-created `cmd`
(created from `self.as_str()`) by doing `let mut cmd = Command::new("winget")`,
leaving the original `cmd` unused; fix by removing the shadowing and reusing the
existing `cmd` (or alternatively move the `Command::new(...)` creation into each
branch and delete the earlier `cmd` creation) so that the `Self::Winget` arm
uses the same `cmd` variable rather than creating a new one; update the
`Self::Winget` branch that currently references `Command::new("winget")` to use
the existing `cmd` variable and ensure `cmd.arg(...)` calls remain correct.

In `@clang-installer/src/downloader/pypi.rs`:
- Around line 470-475: The cached-binary validation currently only compares
fs::metadata(...).len() against file.size() (extracted_bin, meta.len(),
file.size()), which can miss same-size corruption; update the check to compute
and verify a content digest of extracted_bin (using the same hash routine used
earlier for the wheel) and compare it to the expected digest before skipping
extraction, falling back to re-extract if the hash is missing or mismatches; if
computing the digest is expensive, at minimum keep the size check but
additionally compute a SHA256 (or existing digest function) of extracted_bin and
compare to the wheel's verified digest to ensure integrity.

In `@clang-installer/src/version.rs`:
- Around line 338-340: The commented-out assertion in the eval_version test (the
line with // assert!(version_req.matches(&clang_path.version));) should be
either reinstated and fixed or removed with an explanatory comment: locate the
eval_version test and the variables version_req and clang_path, run the test to
see if version_req.matches(&clang_path.version) actually fails; if it fails,
correct the version resolution logic (where eval_version constructs
clang_path/version_req) so the match holds and re-enable the assertion,
otherwise remove the dead assert and add a short comment explaining why the
check is intentionally disabled.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@clang-installer/src/downloader/pypi.rs`:
- Around line 427-449: The cache-population code around checking is_cache_valid,
downloading to cached_wheel, and extracting to extracted_bin has a race between
processes; wrap the entire "check-then-act" block (the path that performs
download(&Url::parse(&info.url)?, &cached_wheel, 60).await? and
Self::extract_bin(...)) in a per-artifact file lock so only one process
populates a given cached_wheel/extracted_bin at a time: create a lock file
(e.g., cached_wheel.with_extension("lock") or similar) and acquire an advisory
exclusive lock before re-checking is_cache_valid, then perform download and
digest.verify and extract_bin, then release the lock; also apply the same lock
pattern to the other cache-population site referenced in the comment (the block
around lines 469-484) to prevent concurrent downloads/extractions.
- Around line 123-133: is_compatible_with_system currently returns true based
only on target_env and ignores the version stored in LinuxLibC, so wheels with
higher libc requirements can be accepted; update the
LinuxLibC::is_compatible_with_system method to (1) extract the required
major/minor version from the enum variants (LinuxLibC::Glibc and
LinuxLibC::Musl), (2) detect the runtime libc version at startup (e.g., call the
platform-appropriate runtime detection for glibc and musl or fall back to
parsing ldd/ldd --version output) and (3) compare runtime_major:runtime_minor >=
required_major:required_minor and return false if the runtime is older or
detection fails; ensure the code paths in is_compatible_with_system handle both
Glibc and Musl variants and return false for unknown/unsupported cases.

In `@clang-installer/src/progress_bar.rs`:
- Around line 40-45: The doctest passes an Option<u64> to ProgressBar::new but
the signature expects Option<NonZero<u64>>; update the example to construct a
NonZero<u64> and pass it as Some(NonZero::new(...).unwrap()). Specifically
modify the example around ProgressBar::new to import or reference
std::num::NonZero and call ProgressBar::new(Some(NonZero::new(100).unwrap()),
"Downloading") so the doctest compiles with the correct type for
ProgressBar::new.

---

Duplicate comments:
In `@clang-installer/src/downloader/mod.rs`:
- Around line 61-73: The temp file is created with NamedTempFile::new() in
another filesystem so tmp_file.persist(cache_path) can fail; instead create the
temp file inside the cache directory before writing so the final rename stays on
the same filesystem. Replace NamedTempFile::new() with creating the temp file in
the cache parent directory (e.g., NamedTempFile::new_in(cache_parent) or
tempfile::Builder::tempfile_in) using the parent of cache_path, then continue
writing, flushing, setting modified time, and calling
tmp_file.persist(cache_path) as before; ensure you handle the case where
cache_path.parent() is None or missing by creating the parent directory first.

In `@clang-installer/src/downloader/pypi.rs`:
- Around line 440-449: The code currently constructs bin_name using only
ver.major which can reuse a same-sized binary from a different patch; update the
naming or identity check so extracted binaries are unique per full version:
change the bin_name format in the block that builds bin_name (referencing
ver.major, bin_name, extracted_bin, cached_wheel and the call Self::extract_bin)
to include the full version (e.g., ver.to_string() or
ver.major,ver.minor,ver.patch) instead of just ver.major, or alternately modify
extract_bin to validate reuse by a stronger identity (e.g., compare a
checksum/sha256 of cached_wheel vs existing file) before skipping extraction so
different patch builds with identical sizes won’t be incorrectly reused.

In `@clang-installer/src/progress_bar.rs`:
- Around line 79-90: The initial 0% state is skipped because when current == 0
you get new_steps == 0 and the existing guard only draws on new_steps >
self.steps; update the guard in ProgressBar::render to also allow the initial
draw when steps == 0 for known totals. Concretely, change the if-let condition
that matches advance_bar to check (new_steps > self.steps) || (self.steps == 0
&& self.current == 0) so render() will draw the 0% bar for the first call (refer
to method render, fields current, steps, total, and constant MAX_BAR_WIDTH).