diff --git a/rust/src/zstd_decompress.rs b/rust/src/zstd_decompress.rs
index 726fd437a..a2602089f 100644
--- a/rust/src/zstd_decompress.rs
+++ b/rust/src/zstd_decompress.rs
@@ -391,30 +391,30 @@ fn legacy_empty_mut_ptr() -> *mut c_void {
  * ignored error result.  The caller owns the projected pointer slot and the
  * C helper's historical behavior is to leave that slot untouched while an
  * initialization attempt replaces it only after successful creation. */
-unsafe fn free_legacy_stream_context(legacy_context: *mut c_void, version: u32) {
+unsafe fn free_legacy_stream_context(_legacy_context: *mut c_void, version: u32) {
     match version {
         #[cfg(feature = "legacy-v04")]
         4 => {
             let _ = crate::legacy::zstd_v04::ZBUFFv04_freeDCtx(
-                legacy_context.cast::<crate::legacy::zstd_v04::ZBUFFv04_DCtx>(),
+                _legacy_context.cast::<crate::legacy::zstd_v04::ZBUFFv04_DCtx>(),
             );
         }
         #[cfg(feature = "legacy-v05")]
         5 => {
             let _ = crate::legacy::zstd_v05::ZBUFFv05_freeDCtx(
-                legacy_context.cast::<crate::legacy::zstd_v05::ZBUFFv05_DCtx>(),
+                _legacy_context.cast::<crate::legacy::zstd_v05::ZBUFFv05_DCtx>(),
             );
         }
         #[cfg(feature = "legacy-v06")]
         6 => {
             let _ = crate::legacy::zstd_v06::ZBUFFv06_freeDCtx(
-                legacy_context.cast::<crate::legacy::zstd_v06::ZBUFFv06_DCtx>(),
+                _legacy_context.cast::<crate::legacy::zstd_v06::ZBUFFv06_DCtx>(),
             );
         }
         #[cfg(feature = "legacy-v07")]
         7 => {
             let _ = crate::legacy::zstd_v07::ZBUFFv07_freeDCtx(
-                legacy_context.cast::<crate::legacy::zstd_v07::ZBUFFv07_DCtx>(),
+                _legacy_context.cast::<crate::legacy::zstd_v07::ZBUFFv07_DCtx>(),
             );
         }
         _ => {}
@@ -432,7 +432,7 @@ unsafe fn init_legacy_stream(
     dict: *const c_void,
     dict_size: usize,
 ) -> usize {
-    let dict = if dict.is_null() {
+    let _dict = if dict.is_null() {
         debug_assert_eq!(dict_size, 0);
         legacy_empty_const_ptr()
     } else {
@@ -461,7 +461,7 @@ unsafe fn init_legacy_stream(
             }
             let _ = crate::legacy::zstd_v04::ZBUFFv04_decompressInit(context);
             let _ = crate::legacy::zstd_v04::ZBUFFv04_decompressWithDictionary(
-                context, dict, dict_size,
+                context, _dict, dict_size,
             );
             set_field(legacy_context_slot, context.cast::<c_void>());
             0
@@ -478,7 +478,7 @@ unsafe fn init_legacy_stream(
                 return ERROR(ZstdErrorCode::MemoryAllocation);
             }
             let _ = crate::legacy::zstd_v05::ZBUFFv05_decompressInitDictionary(
-                context, dict, dict_size,
+                context, _dict, dict_size,
             );
             set_field(legacy_context_slot, context.cast::<c_void>());
             0
@@ -495,7 +495,7 @@ unsafe fn init_legacy_stream(
                 return ERROR(ZstdErrorCode::MemoryAllocation);
             }
             let _ = crate::legacy::zstd_v06::ZBUFFv06_decompressInitDictionary(
-                context, dict, dict_size,
+                context, _dict, dict_size,
             );
             set_field(legacy_context_slot, context.cast::<c_void>());
             0
@@ -512,7 +512,7 @@ unsafe fn init_legacy_stream(
                 return ERROR(ZstdErrorCode::MemoryAllocation);
             }
             let _ = crate::legacy::zstd_v07::ZBUFFv07_decompressInitDictionary(
-                context, dict, dict_size,
+                context, _dict, dict_size,
             );
             set_field(legacy_context_slot, context.cast::<c_void>());
             0
@@ -529,7 +529,7 @@ unsafe fn init_legacy_stream(
  * return the amount they consumed/produced through the public buffer
  * positions. */
 unsafe fn decompress_legacy_stream(
-    legacy_context: *mut c_void,
+    _legacy_context: *mut c_void,
     version: u32,
     output: *mut ZSTD_outBuffer,
     input: *mut ZSTD_inBuffer,
@@ -551,7 +551,7 @@ unsafe fn decompress_legacy_stream(
             let dst = (*output).dst.cast::<u8>().wrapping_add((*output).pos);
             let mut decoded_size = (*output).size.wrapping_sub((*output).pos);
             let hint = crate::legacy::zstd_v04::ZBUFFv04_decompressContinue(
-                legacy_context.cast(),
+                _legacy_context.cast(),
                 dst.cast(),
                 &mut decoded_size,
                 src.cast(),
@@ -568,7 +568,7 @@ unsafe fn decompress_legacy_stream(
             let dst = (*output).dst.cast::<u8>().wrapping_add((*output).pos);
             let mut decoded_size = (*output).size.wrapping_sub((*output).pos);
             let hint = crate::legacy::zstd_v05::ZBUFFv05_decompressContinue(
-                legacy_context.cast(),
+                _legacy_context.cast(),
                 dst.cast(),
                 &mut decoded_size,
                 src.cast(),
@@ -585,7 +585,7 @@ unsafe fn decompress_legacy_stream(
             let dst = (*output).dst.cast::<u8>().wrapping_add((*output).pos);
             let mut decoded_size = (*output).size.wrapping_sub((*output).pos);
             let hint = crate::legacy::zstd_v06::ZBUFFv06_decompressContinue(
-                legacy_context.cast(),
+                _legacy_context.cast(),
                 dst.cast(),
                 &mut decoded_size,
                 src.cast(),
@@ -602,7 +602,7 @@ unsafe fn decompress_legacy_stream(
             let dst = (*output).dst.cast::<u8>().wrapping_add((*output).pos);
             let mut decoded_size = (*output).size.wrapping_sub((*output).pos);
             let hint = crate::legacy::zstd_v07::ZBUFFv07_decompressContinue(
-                legacy_context.cast(),
+                _legacy_context.cast(),
                 dst.cast(),
                 &mut decoded_size,
                 src.cast(),