fix function signatures

build.rs

@@ -182,7 +182,7 @@ impl<'a> SprinklesVersion<'a> {
     }
 }
 
-fn write_colours(file: &mut impl Write) -> std::io::Result<()> {
+fn write_colours(mut file: &File) -> std::io::Result<()> {
     writeln!(file, "pub mod colours {{")?;
     writeln!(file, "#![allow(unused_imports)]")?;
     writeln!(file, "// This file is autogenerated")?;
@@ -234,7 +234,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-fn append_shadow_hooks(file: &mut File) -> shadow_rs::SdResult<()> {
+fn append_shadow_hooks(mut file: &File) -> shadow_rs::SdResult<()> {
     let sfsu_contribs = {
         let contributors = get_contributors(("winpax", "sfsu"));
 
@@ -263,11 +263,13 @@ fn append_shadow_hooks(file: &mut File) -> shadow_rs::SdResult<()> {
 
     writeln!(file, "pub mod sprinkles {{\n{sprinkles_contribs}\n}}")?;
 
-    let lockfile = LOCKFILE.parse::<DocumentMut>().expect("Failed to parse Cargo.lock");
+    let lockfile = LOCKFILE
+        .parse::<DocumentMut>()
+        .expect("Failed to parse Cargo.lock");
 
     writeln!(file, "{}", get_packages(&lockfile))?;
 
-    write_colours(&mut file)?;
+    write_colours(file)?;
 
     Ok(())
 }