diff --git a/crates/spirv-builder/src/lib.rs b/crates/spirv-builder/src/lib.rs
index da3209f5c0..0afba9116d 100644
--- a/crates/spirv-builder/src/lib.rs
+++ b/crates/spirv-builder/src/lib.rs
@@ -92,7 +92,7 @@ pub use rustc_codegen_spirv_types::Capability;
 pub use rustc_codegen_spirv_types::{CompileResult, ModuleResult};
 
 #[cfg(feature = "watch")]
-pub use self::watch::Watch;
+pub use self::watch::{AcceptFirstCompile, Watch};
 
 #[cfg(feature = "include-target-specs")]
 pub use rustc_codegen_spirv_target_specs::TARGET_SPEC_DIR_PATH;
diff --git a/crates/spirv-builder/src/watch.rs b/crates/spirv-builder/src/watch.rs
index 5689393210..b54ec6ad4a 100644
--- a/crates/spirv-builder/src/watch.rs
+++ b/crates/spirv-builder/src/watch.rs
@@ -13,15 +13,10 @@ impl SpirvBuilder {
     /// Watches the module for changes using [`notify`], rebuilding it upon changes.
     ///
     /// Calls `on_compilation_finishes` after each successful compilation.
-    /// The second `Option<AcceptFirstCompile<T>>` param allows you to return some `T`
-    /// on the first compile, which is then returned by this function
-    /// in pair with [`JoinHandle`] to the watching thread.
-    pub fn watch<T>(
-        &self,
-        mut on_compilation_finishes: impl FnMut(CompileResult, Option<AcceptFirstCompile<'_, T>>)
-        + Send
-        + 'static,
-    ) -> Result<Watch<T>, SpirvBuilderError> {
+    pub fn watch<T, F>(&self, mut on_compilation_finishes: F) -> Result<Watch<T>, SpirvBuilderError>
+    where
+        F: FnMut(CompileResult, Option<AcceptFirstCompile<'_, T>>) + Send + 'static,
+    {
         let path_to_crate = self
             .path_to_crate
             .as_ref()
@@ -79,15 +74,14 @@ impl SpirvBuilder {
     }
 }
 
+/// The second parameter of the callback passed to [`SpirvBuilder::watch()`]
+/// which allows it to return some value of `T` on the first compile.
 pub struct AcceptFirstCompile<'a, T>(&'a mut Option<T>);
 
 impl<'a, T> AcceptFirstCompile<'a, T> {
-    pub fn new(write: &'a mut Option<T>) -> Self {
-        Self(write)
-    }
-
-    pub fn submit(self, t: T) {
-        *self.0 = Some(t);
+    /// Accepts some value of `T` to be later returned by [`SpirvBuilder::watch()`].
+    pub fn submit(self, value: T) {
+        *self.0 = Some(value);
     }
 }
 
diff --git a/tests/difftests/lib/src/scaffold/compute/wgpu.rs b/tests/difftests/lib/src/scaffold/compute/wgpu.rs
index 7033f70fe7..a8cee4ec4c 100644
--- a/tests/difftests/lib/src/scaffold/compute/wgpu.rs
+++ b/tests/difftests/lib/src/scaffold/compute/wgpu.rs
@@ -64,7 +64,6 @@ where
                     #[cfg(target_os = "windows")]
                     dx12: wgpu::Dx12BackendOptions {
                         shader_compiler: wgpu::Dx12Compiler::StaticDxc,
-                        ..Default::default()
                     },
                     ..Default::default()
                 },