diff --git a/crates/libs/bindgen/src/rust/handles.rs b/crates/libs/bindgen/src/rust/handles.rs
index 2cadef958ab..4724f125e59 100644
--- a/crates/libs/bindgen/src/rust/handles.rs
+++ b/crates/libs/bindgen/src/rust/handles.rs
@@ -30,7 +30,9 @@ pub fn gen_win_handle(writer: &Writer, def: metadata::TypeDef) -> TokenStream {
     let ident = to_ident(name);
     let underlying_type = def.underlying_type();
     let signature = writer.type_default_name(&underlying_type);
-    let is_invalid = if underlying_type.is_pointer() {
+    let invalid = metadata::type_def_invalid_values(def);
+
+    let is_invalid = if underlying_type.is_pointer() && (invalid.is_empty() || invalid == [0]) {
         quote! {
             impl #ident {
                 pub fn is_invalid(&self) -> bool {
@@ -38,28 +40,24 @@ pub fn gen_win_handle(writer: &Writer, def: metadata::TypeDef) -> TokenStream {
                 }
             }
         }
+    } else if invalid.is_empty() {
+        quote! {}
     } else {
-        let invalid = metadata::type_def_invalid_values(def);
+        let invalid = invalid.iter().map(|value| {
+            let literal = Literal::i64_unsuffixed(*value);
 
-        if !invalid.is_empty() {
-            let invalid = invalid.iter().map(|value| {
-                let literal = Literal::i64_unsuffixed(*value);
-
-                if *value < 0 && underlying_type.is_unsigned() {
-                    quote! { self.0 == #literal as _ }
-                } else {
-                    quote! { self.0 == #literal }
-                }
-            });
-            quote! {
-                impl #ident {
-                    pub fn is_invalid(&self) -> bool {
-                        #(#invalid)||*
-                    }
+            if underlying_type.is_pointer() || (*value < 0 && underlying_type.is_unsigned()) {
+                quote! { self.0 == #literal as _ }
+            } else {
+                quote! { self.0 == #literal }
+            }
+        });
+        quote! {
+            impl #ident {
+                pub fn is_invalid(&self) -> bool {
+                    #(#invalid)||*
                 }
             }
-        } else {
-            quote! {}
         }
     };
 
diff --git a/crates/libs/bindgen/src/rust/structs.rs b/crates/libs/bindgen/src/rust/structs.rs
index 40a02251c04..4d5d7a6f94f 100644
--- a/crates/libs/bindgen/src/rust/structs.rs
+++ b/crates/libs/bindgen/src/rust/structs.rs
@@ -43,34 +43,40 @@ fn gen_struct_with_name(
         quote! { #[repr(C)] }
     };
 
-    let fields = def.fields().map(|f| {
-        let name = to_ident(f.name());
-        let ty = f.ty(Some(def));
-
-        if f.flags().contains(metadata::FieldAttributes::Literal) {
-            quote! {}
-        } else if !writer.sys
-            && flags.contains(metadata::TypeAttributes::ExplicitLayout)
-            && !metadata::field_is_copyable(f, def)
-        {
-            let ty = writer.type_default_name(&ty);
-            quote! { pub #name: core::mem::ManuallyDrop<#ty>, }
-        } else if !writer.sys
-            && !flags.contains(metadata::TypeAttributes::WindowsRuntime)
-            && !metadata::field_is_blittable(f, def)
-        {
-            if let metadata::Type::Win32Array(ty, len) = ty {
+    let fields = if def.fields().next().is_none() {
+        quote! { (pub u8); }
+    } else {
+        let fields = def.fields().map(|f| {
+            let name = to_ident(f.name());
+            let ty = f.ty(Some(def));
+
+            if f.flags().contains(metadata::FieldAttributes::Literal) {
+                quote! {}
+            } else if !writer.sys
+                && flags.contains(metadata::TypeAttributes::ExplicitLayout)
+                && !metadata::field_is_copyable(f, def)
+            {
                 let ty = writer.type_default_name(&ty);
-                quote! { pub #name: [core::mem::ManuallyDrop<#ty>; #len], }
+                quote! { pub #name: core::mem::ManuallyDrop<#ty>, }
+            } else if !writer.sys
+                && !flags.contains(metadata::TypeAttributes::WindowsRuntime)
+                && !metadata::field_is_blittable(f, def)
+            {
+                if let metadata::Type::Win32Array(ty, len) = ty {
+                    let ty = writer.type_default_name(&ty);
+                    quote! { pub #name: [core::mem::ManuallyDrop<#ty>; #len], }
+                } else {
+                    let ty = writer.type_default_name(&ty);
+                    quote! { pub #name: core::mem::ManuallyDrop<#ty>, }
+                }
             } else {
                 let ty = writer.type_default_name(&ty);
-                quote! { pub #name: core::mem::ManuallyDrop<#ty>, }
+                quote! { pub #name: #ty, }
             }
-        } else {
-            let ty = writer.type_default_name(&ty);
-            quote! { pub #name: #ty, }
-        }
-    });
+        });
+
+        quote! { {#(#fields)*} }
+    };
 
     let struct_or_union = if flags.contains(metadata::TypeAttributes::ExplicitLayout) {
         quote! { union }
@@ -85,7 +91,7 @@ fn gen_struct_with_name(
         #repr
         #features
         #derive
-        pub #struct_or_union #name {#(#fields)*}
+        pub #struct_or_union #name #fields
     };
 
     tokens.combine(&gen_struct_constants(writer, def, &name, &cfg));
diff --git a/crates/libs/core/src/imp/waiter.rs b/crates/libs/core/src/imp/waiter.rs
index 3f12eb98813..de36ed4eec6 100644
--- a/crates/libs/core/src/imp/waiter.rs
+++ b/crates/libs/core/src/imp/waiter.rs
@@ -1,8 +1,10 @@
 use super::*;
 
 #[doc(hidden)]
-pub struct Waiter(isize);
-pub struct WaiterSignaler(isize);
+pub struct Waiter(HANDLE);
+pub struct WaiterSignaler(HANDLE);
+
+unsafe impl Send for WaiterSignaler {}
 
 impl Waiter {
     pub fn new() -> crate::Result<(Waiter, WaiterSignaler)> {
diff --git a/crates/libs/windows/src/Windows/Win32/Foundation/mod.rs b/crates/libs/windows/src/Windows/Win32/Foundation/mod.rs
index 236dbdf4610..3cdd6f0f908 100644
--- a/crates/libs/windows/src/Windows/Win32/Foundation/mod.rs
+++ b/crates/libs/windows/src/Windows/Win32/Foundation/mod.rs
@@ -10688,7 +10688,7 @@ impl windows_core::TypeKind for HANDLE_PTR {
 pub struct HGLOBAL(pub *mut core::ffi::c_void);
 impl HGLOBAL {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl windows_core::Free for HGLOBAL {
@@ -10740,7 +10740,7 @@ impl From<HINSTANCE> for HMODULE {
 pub struct HLOCAL(pub *mut core::ffi::c_void);
 impl HLOCAL {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl windows_core::Free for HLOCAL {
diff --git a/crates/libs/windows/src/Windows/Win32/Security/Cryptography/mod.rs b/crates/libs/windows/src/Windows/Win32/Security/Cryptography/mod.rs
index f4fdc7ce1b1..fb5a6d7e497 100644
--- a/crates/libs/windows/src/Windows/Win32/Security/Cryptography/mod.rs
+++ b/crates/libs/windows/src/Windows/Win32/Security/Cryptography/mod.rs
@@ -14306,7 +14306,7 @@ impl windows_core::TypeKind for HCERTCHAINENGINE {
 pub struct HCERTSTORE(pub *mut core::ffi::c_void);
 impl HCERTSTORE {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl Default for HCERTSTORE {
@@ -14322,7 +14322,7 @@ impl windows_core::TypeKind for HCERTSTORE {
 pub struct HCERTSTOREPROV(pub *mut core::ffi::c_void);
 impl HCERTSTOREPROV {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl Default for HCERTSTOREPROV {
diff --git a/crates/libs/windows/src/Windows/Win32/Security/mod.rs b/crates/libs/windows/src/Windows/Win32/Security/mod.rs
index 9f01e27b1ca..b501ab9d3b4 100644
--- a/crates/libs/windows/src/Windows/Win32/Security/mod.rs
+++ b/crates/libs/windows/src/Windows/Win32/Security/mod.rs
@@ -2671,7 +2671,7 @@ impl Default for PRIVILEGE_SET {
 pub struct PSECURITY_DESCRIPTOR(pub *mut core::ffi::c_void);
 impl PSECURITY_DESCRIPTOR {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl Default for PSECURITY_DESCRIPTOR {
diff --git a/crates/libs/windows/src/Windows/Win32/UI/WindowsAndMessaging/mod.rs b/crates/libs/windows/src/Windows/Win32/UI/WindowsAndMessaging/mod.rs
index edb22e7e017..918c9cef806 100644
--- a/crates/libs/windows/src/Windows/Win32/UI/WindowsAndMessaging/mod.rs
+++ b/crates/libs/windows/src/Windows/Win32/UI/WindowsAndMessaging/mod.rs
@@ -8227,7 +8227,7 @@ impl From<HCURSOR> for HICON {
 pub struct HDEVNOTIFY(pub *mut core::ffi::c_void);
 impl HDEVNOTIFY {
     pub fn is_invalid(&self) -> bool {
-        self.0.is_null()
+        self.0 == -1 as _ || self.0 == 0 as _
     }
 }
 impl windows_core::Free for HDEVNOTIFY {
diff --git a/crates/libs/windows/src/lib.rs b/crates/libs/windows/src/lib.rs
index ba41e5e4df1..3072303ccca 100644
--- a/crates/libs/windows/src/lib.rs
+++ b/crates/libs/windows/src/lib.rs
@@ -9,8 +9,8 @@ Learn more about Rust for Windows here: <https://github.com/microsoft/windows-rs
 #![doc(html_no_source)]
 #![allow(non_snake_case, clashing_extern_declarations, non_upper_case_globals, non_camel_case_types, missing_docs, clippy::all)]
 #![cfg_attr(not(feature = "docs"), doc(hidden))]
-// TODO: https://github.com/microsoft/windows-rs/issues/3096
-#![allow(dead_code)]
+// TODO: workaround for https://github.com/rust-lang/rust/issues/126169
+#![allow(unused)]
 
 #[allow(unused_extern_crates)]
 extern crate self as windows;
diff --git a/crates/tests/lib/Cargo.toml b/crates/tests/lib/Cargo.toml
index 37c3d2ab287..54d98f0a77e 100644
--- a/crates/tests/lib/Cargo.toml
+++ b/crates/tests/lib/Cargo.toml
@@ -32,6 +32,3 @@ features = [
 
 [dependencies.windows-targets]
 path = "../../libs/targets"
-
-[dependencies.mio]
-version = "0.8.6"