Add dump-ast example program
diff --git a/examples/dump-ast.rs b/examples/dump-ast.rs
new file mode 100644
index 0000000..f59fe73
--- /dev/null
+++ b/examples/dump-ast.rs
@@ -0,0 +1,28 @@
+#![cfg(all(feature = "full", feature = "extra-traits"))]
+extern crate syn;
+
+use std::env;
+use std::fs::File;
+use std::io::{self, Read};
+
+fn main() {
+ let mut args = env::args();
+ let _ = args.next(); // executable name
+ let filename = args.next().unwrap_or_else(|| {
+ panic!("USAGE: dump-ast FILENAME");
+ });
+ if args.next().is_some() {
+ panic!("dump-ast only takes one argument");
+ }
+
+ let mut src = String::new();
+ if filename != "-" {
+ let mut file = File::open(&filename).expect("Unable to open source file");
+ file.read_to_string(&mut src).expect("Unable to read input file");
+ } else {
+ io::stdin().read_to_string(&mut src).expect("Unable to read stdin");
+ }
+
+ let ast = syn::parse_file(&src).expect("Unable to parse file");
+ println!("{:#?}", ast);
+}