diff --git a/generic-rt/src/lib.rs b/generic-rt/src/lib.rs
index 333c0e8e02..394db7b9f8 100644
--- a/generic-rt/src/lib.rs
+++ b/generic-rt/src/lib.rs
@@ -92,7 +92,7 @@ impl<Os> GenericTcb<Os> {
         Some(&mut *Self::current_ptr()?)
     }
 }
-pub fn panic_notls(msg: impl core::fmt::Display) -> ! {
+pub fn panic_notls(_msg: impl core::fmt::Display) -> ! {
     //eprintln!("panicked in ld.so: {}", msg);
 
     core::intrinsics::abort();
diff --git a/redox-rt/src/arch/x86_64.rs b/redox-rt/src/arch/x86_64.rs
index f1e5827ece..cf9d69388a 100644
--- a/redox-rt/src/arch/x86_64.rs
+++ b/redox-rt/src/arch/x86_64.rs
@@ -12,11 +12,8 @@ use syscall::{
 
 use crate::{
     proc::{fork_inner, FdGuard},
-    signal::{
-        get_sigaltstack, inner_c, PosixStackt, RtSigarea, SigStack, Sigaltstack,
-        PROC_CONTROL_STRUCT,
-    },
-    RtTcb, Tcb,
+    signal::{get_sigaltstack, inner_c, PosixStackt, RtSigarea, SigStack, PROC_CONTROL_STRUCT},
+    Tcb,
 };
 
 // Setup a stack starting from the very end of the address space, and then growing downwards.
diff --git a/redox-rt/src/lib.rs b/redox-rt/src/lib.rs
index 4505a066e1..131a21b01c 100644
--- a/redox-rt/src/lib.rs
+++ b/redox-rt/src/lib.rs
@@ -1,6 +1,5 @@
 #![no_std]
 #![feature(
-    asm_const,
     array_chunks,
     int_roundings,
     let_chains,
diff --git a/redox-rt/src/signal.rs b/redox-rt/src/signal.rs
index a39a96ad72..f303383957 100644
--- a/redox-rt/src/signal.rs
+++ b/redox-rt/src/signal.rs
@@ -1,17 +1,9 @@
-use core::{
-    cell::{Cell, UnsafeCell},
-    ffi::{c_int, c_void},
-    mem::MaybeUninit,
-    ptr::NonNull,
-    sync::atomic::{AtomicU8, AtomicUsize, Ordering},
-};
+use core::{ffi::c_int, mem::MaybeUninit, ptr::NonNull, sync::atomic::Ordering};
 
 use syscall::{
-    data::AtomicU64, Error, NonatomicUsize, RawAction, Result, RtSigInfo, SenderInfo,
-    SetSighandlerData, SigProcControl, Sigcontrol, SigcontrolFlags, TimeSpec, EAGAIN, EINTR,
-    EINVAL, ENOMEM, EPERM, SIGABRT, SIGBUS, SIGCHLD, SIGCONT, SIGFPE, SIGILL, SIGKILL, SIGQUIT,
-    SIGSEGV, SIGSTOP, SIGSYS, SIGTRAP, SIGTSTP, SIGTTIN, SIGTTOU, SIGURG, SIGWINCH, SIGXCPU,
-    SIGXFSZ,
+    data::AtomicU64, Error, RawAction, Result, RtSigInfo, SenderInfo, SetSighandlerData,
+    SigProcControl, Sigcontrol, SigcontrolFlags, TimeSpec, EAGAIN, EINTR, EINVAL, ENOMEM, EPERM,
+    SIGCHLD, SIGKILL, SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU, SIGURG, SIGWINCH,
 };
 
 use crate::{arch::*, proc::FdGuard, sync::Mutex, RtTcb, Tcb};
diff --git a/src/crt0/src/lib.rs b/src/crt0/src/lib.rs
index 59c68e4db0..590b65af3a 100644
--- a/src/crt0/src/lib.rs
+++ b/src/crt0/src/lib.rs
@@ -73,7 +73,7 @@ _start:
 
 #[linkage = "weak"]
 #[no_mangle]
-extern "C" fn relibc_panic(pi: &::core::panic::PanicInfo) -> ! {
+extern "C" fn relibc_panic(_pi: &::core::panic::PanicInfo) -> ! {
     loop {}
 }
 
diff --git a/src/crti/src/lib.rs b/src/crti/src/lib.rs
index 32ead0b3fc..489d14547b 100644
--- a/src/crti/src/lib.rs
+++ b/src/crti/src/lib.rs
@@ -76,7 +76,7 @@ global_asm!(
 
 #[linkage = "weak"]
 #[no_mangle]
-extern "C" fn relibc_panic(pi: &::core::panic::PanicInfo) -> ! {
+extern "C" fn relibc_panic(_pi: &::core::panic::PanicInfo) -> ! {
     loop {}
 }
 
diff --git a/src/crtn/src/lib.rs b/src/crtn/src/lib.rs
index 696e60df60..ccde07b534 100644
--- a/src/crtn/src/lib.rs
+++ b/src/crtn/src/lib.rs
@@ -62,7 +62,7 @@ global_asm!(
 
 #[linkage = "weak"]
 #[no_mangle]
-extern "C" fn relibc_panic(pi: &::core::panic::PanicInfo) -> ! {
+extern "C" fn relibc_panic(_pi: &::core::panic::PanicInfo) -> ! {
     loop {}
 }
 
diff --git a/src/platform/redox/exec.rs b/src/platform/redox/exec.rs
index 30c235e8d6..77f6c99874 100644
--- a/src/platform/redox/exec.rs
+++ b/src/platform/redox/exec.rs
@@ -1,4 +1,7 @@
-use core::num::{NonZeroU64, NonZeroUsize};
+use core::{
+    convert::Infallible,
+    num::{NonZeroU64, NonZeroUsize},
+};
 
 use crate::{
     c_str::{CStr, CString},
@@ -23,7 +26,7 @@ fn fexec_impl(
     total_args_envs_size: usize,
     extrainfo: &ExtraInfo,
     interp_override: Option<InterpOverride>,
-) -> Result<usize> {
+) -> Result<Infallible> {
     let memory = FdGuard::new(syscall::open("/scheme/memory", 0)?);
 
     let addrspace_selection_fd = match redox_rt::proc::fexec_impl(
@@ -91,7 +94,7 @@ pub fn execve(
     exec: Executable<'_>,
     arg_env: ArgEnv,
     interp_override: Option<InterpOverride>,
-) -> Result<usize> {
+) -> Result<Infallible> {
     // NOTE: We must omit O_CLOEXEC and close manually, otherwise it will be closed before we
     // have even read it!
     let (mut image_file, arg0) = match exec {