From 896397f729a016c060f2a4f44188fb945f2eee01 Mon Sep 17 00:00:00 2001
From: ddidderr <ddidderr@paul.network>
Date: Sat, 18 Jul 2026 21:46:36 +0200
Subject: [PATCH] fix(rust): satisfy current clippy lints

The current toolchain promoted two test-only patterns to hard errors under
`-D warnings`: integer-to-pointer casts used as non-null dictionary-handle
sentinels, and a repeat/take construction that Clippy now replaces with
`repeat_n`. The casts never represented addresses and were only placeholders
for ownership fields that the cleanup functions must clear. Use the standard
dangling-pointer constructor for those sentinels and the equivalent concise
iterator for the generated test input. Runtime behavior and the ABI are
unchanged, while the repository's Rust lint gate is warning-free again.

Test Plan:
- `cargo clippy --manifest-path rust/Cargo.toml -- -D warnings` -- passed
- `cargo clippy --manifest-path rust/Cargo.toml --benches -- -D warnings` -- passed
- `cargo clippy --manifest-path rust/Cargo.toml --tests -- -D warnings` -- passed
- `cargo clippy --manifest-path rust/cli/Cargo.toml --all-targets -- -D warnings` -- passed
- `cargo +nightly fmt --manifest-path rust/Cargo.toml` -- passed
- `cargo +nightly fmt --manifest-path rust/cli/Cargo.toml` -- passed
---
 rust/src/fileio_backend.rs | 4 ++--
 rust/src/zstd_compress.rs  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/rust/src/fileio_backend.rs b/rust/src/fileio_backend.rs
index 3f8058138..4bb84943c 100644
--- a/rust/src/fileio_backend.rs
+++ b/rust/src/fileio_backend.rs
@@ -1049,7 +1049,7 @@ mod tests {
         let mapped = unsafe { std::slice::from_raw_parts(buffer.cast::<u8>(), mapped_size) };
         assert_eq!(mapped, payload);
 
-        let mut dict_handle = 1usize as *mut c_void;
+        let mut dict_handle = ptr::dangling_mut::<c_void>();
         unsafe {
             FIO_rust_freeDict(
                 FIO_MMAP_DICT,
@@ -1074,7 +1074,7 @@ mod tests {
         assert!(!allocation.is_null());
         let mut buffer = allocation;
         let mut buffer_size = 16;
-        let mut dict_handle = 1usize as *mut c_void;
+        let mut dict_handle = ptr::dangling_mut::<c_void>();
 
         unsafe {
             FIO_rust_freeDict(
diff --git a/rust/src/zstd_compress.rs b/rust/src/zstd_compress.rs
index e679a3475..db57ae118 100644
--- a/rust/src/zstd_compress.rs
+++ b/rust/src/zstd_compress.rs
@@ -4573,7 +4573,7 @@ mod tests {
     #[test]
     fn one_shot_promotes_nonfirst_rle_blocks() {
         let mut input = vec![b'B'; 256 * 1024 - 2];
-        input.extend(std::iter::repeat(b'A').take(100 * 1024));
+        input.extend(std::iter::repeat_n(b'A', 100 * 1024));
 
         let compressed = compress_input(&input, 1);
         assert!(compressed.len() <= 46);