Fix new Fn<Arguments: Tuple> bounds

See: rust-lang/rust#99943

Author: Hpmason

src/detours/statik.rs

@@ -1,5 +1,6 @@
 use crate::error::{Error, Result};
 use crate::{Function, GenericDetour};
+use std::marker::Tuple;
 use std::sync::atomic::{AtomicPtr, Ordering};
 use std::{mem, ptr};
 
@@ -104,6 +105,7 @@ impl<T: Function> StaticDetour<T> {
   pub unsafe fn initialize<D>(&self, target: T, closure: D) -> Result<&Self>
   where
     D: Fn<T::Arguments, Output = T::Output> + Send + 'static,
+    <T as Function>::Arguments: Tuple,
   {
     let mut detour = Box::new(GenericDetour::new(target, self.ffi)?);
     if self
@@ -155,6 +157,7 @@ impl<T: Function> StaticDetour<T> {
   pub fn set_detour<C>(&self, closure: C)
   where
     C: Fn<T::Arguments, Output = T::Output> + Send + 'static,
+    <T as Function>::Arguments: Tuple,
   {
     let previous = self
       .closure
@@ -175,7 +178,10 @@ impl<T: Function> StaticDetour<T> {
 
   /// Returns a transient reference to the active detour.
   #[doc(hidden)]
-  pub fn __detour(&self) -> &dyn Fn<T::Arguments, Output = T::Output> {
+  pub fn __detour(&self) -> &dyn Fn<T::Arguments, Output = T::Output>
+  where
+    <T as Function>::Arguments: Tuple,
+  {
     // TODO: This is not 100% thread-safe in case the thread is stopped
     unsafe { self.closure.load(Ordering::SeqCst).as_ref() }
       .ok_or(Error::NotInitialized)

src/lib.rs

@@ -1,5 +1,12 @@
 #![recursion_limit = "1024"]
-#![cfg_attr(feature = "nightly", feature(unboxed_closures, abi_thiscall))]
+#![cfg_attr(
+  feature = "nightly",
+<<<<<<< HEAD
+  feature(unboxed_closures, abi_thiscall, tuple_trait)
+=======
+  feature(const_fn, const_fn_trait_bound, unboxed_closures, abi_thiscall)
+>>>>>>> parent of 3b6f17a (Remove obsolete const_fn feature gate on nightly)
+)]
 #![cfg_attr(
   all(feature = "nightly", test),
   feature(naked_functions, core_intrinsics)