diff --git a/fil-proofs-param/src/bin/fakeipfsadd.rs b/fil-proofs-param/src/bin/fakeipfsadd.rs
index 63472c49b8..b1cf0dbc94 100644
--- a/fil-proofs-param/src/bin/fakeipfsadd.rs
+++ b/fil-proofs-param/src/bin/fakeipfsadd.rs
@@ -16,6 +16,8 @@ enum Cli {
     Add {
         #[structopt(help = "Positional argument for the path to the file to add.")]
         file_path: String,
+        #[structopt(short = "Q", help = "Simulates the -Q argument to `ipfs add`.")]
+        _quieter: bool,
     },
 }
 
diff --git a/fil-proofs-param/tests/paramfetch/session.rs b/fil-proofs-param/tests/paramfetch/session.rs
index f54e7354f8..0fdb4f9a4b 100644
--- a/fil-proofs-param/tests/paramfetch/session.rs
+++ b/fil-proofs-param/tests/paramfetch/session.rs
@@ -63,7 +63,7 @@ impl ParamFetchSessionBuilder {
 
     /// Launch paramfetch in an environment configured by the builder.
     pub fn build(self) -> ParamFetchSession {
-        let session = match spawn_bash_with_retries(10, Some(self.session_timeout_ms)) {
+        let pty_session = match spawn_bash_with_retries(10, Some(self.session_timeout_ms)) {
             Err(e) => panic_any(e),
             Ok(mut session) => {
                 let cache_dir_path = format!("{:?}", self.cache_dir.path());
@@ -103,7 +103,7 @@ impl ParamFetchSessionBuilder {
         };
 
         ParamFetchSession {
-            pty_session: session,
+            pty_session,
             _cache_dir: self.cache_dir,
         }
     }
diff --git a/fil-proofs-param/tests/parampublish/support/session.rs b/fil-proofs-param/tests/parampublish/support/session.rs
index 7a5e7f4d5e..5b050172e4 100644
--- a/fil-proofs-param/tests/parampublish/support/session.rs
+++ b/fil-proofs-param/tests/parampublish/support/session.rs
@@ -116,7 +116,7 @@ impl ParamPublishSessionBuilder {
 
     /// Launch parampublish in an environment configured by the builder.
     pub fn build(self) -> (ParamPublishSession, Vec<PathBuf>) {
-        let session = match spawn_bash_with_retries(10, Some(self.session_timeout_ms)) {
+        let pty_session = match spawn_bash_with_retries(10, Some(self.session_timeout_ms)) {
             Err(err) => panic_any(err),
             Ok(mut session) => {
                 let cache_dir_path = format!("{:?}", self.cache_dir.path());
@@ -148,7 +148,7 @@ impl ParamPublishSessionBuilder {
 
         (
             ParamPublishSession {
-                pty_session: session,
+                pty_session,
                 _cache_dir: self.cache_dir,
             },
             cache_contents,
diff --git a/sha2raw/src/sha256_intrinsics.rs b/sha2raw/src/sha256_intrinsics.rs
index 17ab2ba8cd..5311012508 100644
--- a/sha2raw/src/sha256_intrinsics.rs
+++ b/sha2raw/src/sha256_intrinsics.rs
@@ -14,11 +14,16 @@ use x86::{
 
 /// Process a block with the SHA-256 algorithm.
 /// Based on https://github.com/noloader/SHA-Intrinsics/blob/master/sha256-x86.c
+#[allow(clippy::needless_late_init)]
 #[inline(always)]
 pub unsafe fn compress256(state: &mut [u32; 8], blocks: &[&[u8]]) {
     assert_eq!(blocks.len() % 2, 0);
 
+    let mut state0: __m128i;
+    let mut state1: __m128i;
+
     let mut msg: __m128i;
+    let mut tmp: __m128i;
 
     let mut msg0: __m128i;
     let mut msg1: __m128i;
@@ -35,12 +40,12 @@ pub unsafe fn compress256(state: &mut [u32; 8], blocks: &[&[u8]]) {
     );
 
     // Load initial values
-    let mut tmp = _mm_loadu_si128(state.as_ptr().add(0) as *const __m128i);
-    let mut state1 = _mm_loadu_si128(state.as_ptr().add(4) as *const __m128i);
+    tmp = _mm_loadu_si128(state.as_ptr().add(0) as *const __m128i);
+    state1 = _mm_loadu_si128(state.as_ptr().add(4) as *const __m128i);
 
     tmp = _mm_shuffle_epi32(tmp, 0xB1); // CDAB
     state1 = _mm_shuffle_epi32(state1, 0x1B); // EFGH
-    let mut state0 = _mm_alignr_epi8(tmp, state1, 8); // ABEF
+    state0 = _mm_alignr_epi8(tmp, state1, 8); // ABEF
     state1 = _mm_blend_epi16(state1, tmp, 0xF0); // CDGH
 
     for i in (0..blocks.len()).step_by(2) {
diff --git a/storage-proofs-porep/src/stacked/vanilla/create_label/multi.rs b/storage-proofs-porep/src/stacked/vanilla/create_label/multi.rs
index 14711372ea..e3a9ca38ec 100644
--- a/storage-proofs-porep/src/stacked/vanilla/create_label/multi.rs
+++ b/storage-proofs-porep/src/stacked/vanilla/create_label/multi.rs
@@ -58,8 +58,8 @@ fn fill_buffer(
     cur_node: u64,
     parents_cache: &CacheReader<u32>,
     mut cur_parent: &[u32], // parents for this node
-    layer_labels: &UnsafeSlice<u32>,
-    exp_labels: Option<&UnsafeSlice<u32>>, // None for layer0
+    layer_labels: &UnsafeSlice<'_, u32>,
+    exp_labels: Option<&UnsafeSlice<'_, u32>>, // None for layer0
     buf: &mut [u8],
     base_parent_missing: &mut BitMask,
 ) {
@@ -140,15 +140,15 @@ fn fill_buffer(
 #[allow(clippy::too_many_arguments)]
 fn create_label_runner(
     parents_cache: &CacheReader<u32>,
-    layer_labels: &UnsafeSlice<u32>,
-    exp_labels: Option<&UnsafeSlice<u32>>, // None for layer 0
+    layer_labels: &UnsafeSlice<'_, u32>,
+    exp_labels: Option<&UnsafeSlice<'_, u32>>, // None for layer 0
     num_nodes: u64,
     cur_producer: &AtomicU64,
     cur_awaiting: &AtomicU64,
     stride: u64,
     lookahead: u64,
     ring_buf: &RingBuf,
-    base_parent_missing: &UnsafeSlice<BitMask>,
+    base_parent_missing: &UnsafeSlice<'_, BitMask>,
 ) {
     info!("created label runner");
     // Label data bytes per node
diff --git a/storage-proofs-porep/src/stacked/vanilla/utils.rs b/storage-proofs-porep/src/stacked/vanilla/utils.rs
index 7a2a4adc2f..a4506d3789 100644
--- a/storage-proofs-porep/src/stacked/vanilla/utils.rs
+++ b/storage-proofs-porep/src/stacked/vanilla/utils.rs
@@ -4,41 +4,44 @@ use std::slice::{self, ChunksExactMut};
 /// A slice type which can be shared between threads, but must be fully managed by the caller.
 /// Any synchronization must be ensured by the caller, which is why all access is `unsafe`.
 #[derive(Debug)]
-pub struct UnsafeSlice<T> {
+pub struct UnsafeSlice<'a, T> {
+    // holds the data to ensure lifetime correctness
+    _data: UnsafeCell<&'a mut [T]>,
     /// pointer to the data
     ptr: *mut T,
     /// Number of elements, not bytes.
     len: usize,
 }
 
-unsafe impl<T> Sync for UnsafeSlice<T> {}
+unsafe impl<'a, T> Sync for UnsafeSlice<'a, T> {}
 
-impl<T> UnsafeSlice<T> {
+impl<'a, T> UnsafeSlice<'a, T> {
     /// Takes mutable slice, to ensure that `UnsafeSlice` is the only user of this memory, until it gets dropped.
-    pub fn from_slice(source: &mut [T]) -> Self {
+    pub fn from_slice(source: &'a mut [T]) -> Self {
         let len = source.len();
         let ptr = source.as_mut_ptr();
-        Self { ptr, len }
+        let _data = UnsafeCell::new(source);
+        Self { _data, ptr, len }
     }
 
     /// Safety: The caller must ensure that there are no unsynchronized parallel access to the same regions.
     #[inline]
-    pub unsafe fn as_mut_slice(&self) -> &mut [T] {
+    pub unsafe fn as_mut_slice(&self) -> &'a mut [T] {
         slice::from_raw_parts_mut(self.ptr, self.len)
     }
     /// Safety: The caller must ensure that there are no unsynchronized parallel access to the same regions.
     #[inline]
-    pub unsafe fn as_slice(&self) -> &[T] {
+    pub unsafe fn as_slice(&self) -> &'a [T] {
         slice::from_raw_parts(self.ptr, self.len)
     }
 
     #[inline]
-    pub unsafe fn get(&self, index: usize) -> &T {
+    pub unsafe fn get(&self, index: usize) -> &'a T {
         &*self.ptr.add(index)
     }
 
     #[inline]
-    pub unsafe fn get_mut(&self, index: usize) -> &mut T {
+    pub unsafe fn get_mut(&self, index: usize) -> &'a mut T {
         &mut *self.ptr.add(index)
     }
 }