diff --git a/lox-examples/expr.lox b/lox-examples/expr.lox
new file mode 100644
index 0000000..8858afb
--- /dev/null
+++ b/lox-examples/expr.lox
@@ -0,0 +1 @@
+(1 + -2) * 4 < 0 == true != !false
diff --git a/src/runners/file.rs b/src/runners/file.rs
index a5fea82..dd34cee 100644
--- a/src/runners/file.rs
+++ b/src/runners/file.rs
@@ -1,8 +1,9 @@
 use std::path::Path;
 
-use crate::scanner::scan;
 use miette::{IntoDiagnostic, Report, Result, WrapErr};
 
+use crate::{parser::parse, scanner::scan};
+
 #[tracing::instrument(skip_all, fields(path = %path.display()))]
 pub fn run_file(path: &Path) -> Result<()> {
     tracing::debug!("reading lox file");
@@ -11,8 +12,11 @@ pub fn run_file(path: &Path) -> Result<()> {
         .wrap_err_with(|| format!("failed to open file: {}", path.display()))?;
 
     tracing::debug!("scanning");
-    let tokens = scan(&contents).map_err(|e| Report::new(e).with_source_code(contents))?;
+    let tokens = scan(&contents).map_err(|e| Report::new(e).with_source_code(contents.clone()))?;
     dbg!(&tokens.len());
 
+    let ast = parse(tokens).map_err(|e| Report::new(e).with_source_code(contents))?;
+    dbg!(&ast);
+
     Ok(())
 }
diff --git a/src/span.rs b/src/span.rs
index d888de0..ffae3c6 100644
--- a/src/span.rs
+++ b/src/span.rs
@@ -1,4 +1,4 @@
-use std::fmt::{Display, Formatter};
+use std::fmt::{Debug, Display, Formatter};
 use std::ops::{Deref, DerefMut, Range};
 
 use miette::SourceSpan;
@@ -29,7 +29,7 @@ impl Span {
     }
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone)]
 pub struct Spanned<T>(T, Span);
 
 impl<T> Spanned<T> {
@@ -55,6 +55,18 @@ impl<T> DerefMut for Spanned<T> {
     }
 }
 
+impl<T> Debug for Spanned<T>
+where
+    T: Debug,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_tuple("")
+            .field(&self.1.as_range())
+            .field(&self.0)
+            .finish()
+    }
+}
+
 impl From<Span> for SourceSpan {
     fn from(span: Span) -> Self {
         span.as_range().into()