Polish dump-ast example code
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+Parse a Rust source file into a `syn::File` and print out a debug representation
+of the syntax tree.
+
+Use the following command from this directory to test this program by running it
+on its own source code:
+
+```
+cargo run -- main.rs
+```
+
+The output will begin with:
+
+```
+File {
+ shebang: None,
+ attrs: [
+ Attribute {
+ pound_token: Pound,
+ style: Inner(
+ Bang
+ ),
+ bracket_token: Bracket,
+ path: Path {
+ leading_colon: None,
+ segments: [
+ ...
+}
+```