2 files changed, 8 insertions, 8 deletions
diff --git a/src/main.rs b/src/main.rs
index e58188b..a78d9c1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,7 +25,7 @@ fn main() {
     // TODO dump command-line args into MAKEFLAGS
     // TODO dump command-line macros into environment
     // TODO add SHELL macro
-    let mut makefile = Makefile::new(args.clone());
+    let mut makefile = Makefile::new(&args);
     for filename in &args.makefile {
         if filename == &PathBuf::from("-") {
             makefile.and_read(stdin().lock());
diff --git a/src/makefile/mod.rs b/src/makefile/mod.rs
index d55238e..dae742f 100644
--- a/src/makefile/mod.rs
+++ b/src/makefile/mod.rs
@@ -209,17 +209,17 @@ enum MacroSource {
     Builtin,
 }
 
-pub struct Makefile {
+pub struct Makefile<'a> {
     inference_rules: Vec<InferenceRule>,
     macros: HashMap<String, (MacroSource, TokenString)>,
     targets: RefCell<HashMap<String, Rc<RefCell<Target>>>>,
     pub first_non_special_target: Option<String>,
-    args: Args,
+    args: &'a Args,
     // TODO borrow warnings from Python version
 }
 
-impl Makefile {
-    pub fn new(args: Args) -> Makefile {
+impl<'a> Makefile<'a> {
+    pub fn new(args: &'a Args) -> Self {
         let mut inference_rules = vec![];
         let mut macros = HashMap::new();
         let mut targets = HashMap::new();
@@ -264,7 +264,7 @@ impl Makefile {
         }
     }
 
-    pub fn and_read_file(&mut self, path: impl AsRef<Path>) -> &mut Makefile {
+    pub fn and_read_file(&mut self, path: impl AsRef<Path>) -> &mut Self {
         let file = File::open(path);
         // TODO handle errors
         let file = file.expect("couldn't open makefile!");
@@ -272,7 +272,7 @@ impl Makefile {
         self.and_read(file_reader)
     }
 
-    pub fn and_read(&mut self, source: impl BufRead) -> &mut Makefile {
+    pub fn and_read(&mut self, source: impl BufRead) -> &mut Self {
         let mut lines_iter = source.lines().enumerate().peekable();
         while let Some((line_number, line)) = lines_iter.next() {
             // TODO handle I/O errors at all
@@ -754,7 +754,7 @@ impl Makefile {
     }
 }
 
-impl fmt::Display for Makefile {
+impl fmt::Display for Makefile<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let header = |f: &mut fmt::Formatter, t: &str| {
             writeln!(f, "{}\n{:=^width$}", t, "", width = t.len())