diff --git a/tasks/ast_tools/src/codegen.rs b/tasks/ast_tools/src/codegen.rs
index eb4bff99b7f63..4722b444855c9 100644
--- a/tasks/ast_tools/src/codegen.rs
+++ b/tasks/ast_tools/src/codegen.rs
@@ -27,39 +27,36 @@ pub struct AstCodegenResult {
     pub outputs: Vec<SideEffect>,
 }
 
-pub enum SideEffect {
-    /// File write side-effect
-    Write(/* path */ PathBuf, /* output */ Vec<u8>),
-}
+pub struct SideEffect(/* path */ pub PathBuf, /* output */ pub Vec<u8>);
 
 impl SideEffect {
     /// Apply the side-effect
     pub fn apply(self) -> std::io::Result<()> {
-        match self {
-            Self::Write(path, data) => {
-                let path = path.into_os_string();
-                let path = path.to_str().unwrap();
-                write_all_to(&data, path)?;
-                Ok(())
-            }
-        }
+        let Self(path, data) = self;
+        let path = path.into_os_string();
+        let path = path.to_str().unwrap();
+        write_all_to(&data, path)?;
+        Ok(())
     }
 
     #[allow(clippy::unnecessary_wraps)]
     pub fn path(&self) -> Option<String> {
-        match self {
-            Self::Write(path, _) => {
-                let path = path.to_string_lossy();
-                Some(path.replace('\\', "/"))
-            }
-        }
+        let Self(path, _) = self;
+        let path = path.to_string_lossy();
+        Some(path.replace('\\', "/"))
     }
 }
 
 impl From<(PathBuf, TokenStream)> for SideEffect {
     fn from((path, stream): (PathBuf, TokenStream)) -> Self {
         let content = pretty_print(&stream);
-        Self::Write(path, content.as_bytes().into())
+        Self(path, content.as_bytes().into())
+    }
+}
+
+impl From<GeneratorOutput> for SideEffect {
+    fn from(output: GeneratorOutput) -> Self {
+        Self::from((output.0, output.1))
     }
 }
 
@@ -207,7 +204,7 @@ impl AstCodegen {
             .generators
             .into_iter()
             .map(|mut runner| runner.run(&ctx))
-            .map_ok(|output| SideEffect::from((output.0, output.1)))
+            .map_ok(SideEffect::from)
             .chain(derives)
             .collect::<Result<Vec<_>>>()?;
 
diff --git a/tasks/ast_tools/src/derives/clone_in.rs b/tasks/ast_tools/src/derives/clone_in.rs
index 8621b95e8c17a..6099b50ad82fb 100644
--- a/tasks/ast_tools/src/derives/clone_in.rs
+++ b/tasks/ast_tools/src/derives/clone_in.rs
@@ -91,7 +91,6 @@ fn impl_clone_in(
 ) -> TokenStream {
     if has_lifetime {
         quote! {
-            ///@@line_break
             impl <'old_alloc, 'new_alloc> CloneIn<'new_alloc> for #ty_ident<'old_alloc> {
                 type Cloned = #ty_ident<'new_alloc>;
                 fn clone_in(&self, #alloc_ident: &'new_alloc Allocator) -> Self::Cloned {
@@ -101,7 +100,6 @@ fn impl_clone_in(
         }
     } else {
         quote! {
-            ///@@line_break
             impl <'alloc> CloneIn<'alloc> for #ty_ident {
                 type Cloned = #ty_ident;
                 fn clone_in(&self, #alloc_ident: &'alloc Allocator) -> Self::Cloned {
diff --git a/tasks/ast_tools/src/derives/get_span.rs b/tasks/ast_tools/src/derives/get_span.rs
index 204194b8274a0..2eb0d9840d1d2 100644
--- a/tasks/ast_tools/src/derives/get_span.rs
+++ b/tasks/ast_tools/src/derives/get_span.rs
@@ -98,7 +98,6 @@ fn derive_enum(
     });
 
     quote! {
-        ///@@line_break
         impl #generics #trait_name for #target_type {
             fn #method_name(#self_type) -> #result_type {
                 match self {
@@ -129,7 +128,6 @@ fn derive_struct(
     };
 
     quote! {
-        ///@@line_break
         impl #generics #trait_name for #target_type {
             #[inline]
             fn #method_name(#self_type) -> #result_type {
diff --git a/tasks/ast_tools/src/derives/mod.rs b/tasks/ast_tools/src/derives/mod.rs
index b3cd9f3b72bc1..dbcf4c76ba5ac 100644
--- a/tasks/ast_tools/src/derives/mod.rs
+++ b/tasks/ast_tools/src/derives/mod.rs
@@ -27,6 +27,7 @@ pub struct DeriveOutput(pub Vec<(PathBuf, TokenStream)>);
 macro_rules! define_derive {
     ($vis:vis struct $ident:ident $($lifetime:lifetime)? $($rest:tt)*) => {
         $vis struct $ident $($lifetime)? $($rest)*
+
         impl $($lifetime)? $crate::derives::DeriveTemplate for $ident $($lifetime)? {
             fn template(module_paths: Vec<&str>, impls: TokenStream) -> TokenStream {
                 use itertools::Itertools;
@@ -61,6 +62,7 @@ macro_rules! define_derive {
                 }
             }
         }
+
         impl $($lifetime)? $crate::codegen::Runner for $ident $($lifetime)? {
             type Context = $crate::codegen::LateCtx;
             type Output = $crate::derives::DeriveOutput;