4 files changed, 50 insertions, 0 deletions
diff --git a/syn/dev/Cargo.toml b/syn/dev/Cargo.toml
new file mode 100644
index 0000000..79486c1
--- /dev/null
+++ b/syn/dev/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "syn-dev"
+version = "0.0.0"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+edition = "2018"
+publish = false
+
+[lib]
+path = "parse.rs"
+proc-macro = true
+
+[[bin]]
+path = "main.rs"
+name = "syn-dev"
+
+[dependencies]
+quote = "1.0"
+
+[dependencies.syn]
+path = ".."
+default-features = false
+features = ["parsing", "full", "extra-traits", "proc-macro"]
diff --git a/syn/dev/README.md b/syn/dev/README.md
new file mode 100644
index 0000000..91b9846
--- /dev/null
+++ b/syn/dev/README.md
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+A little project skeleton for troubleshooting Syn's parsers during development,
+especially when adding support for new Rust syntax.
+
+Place a sample of the syntax you are working on into main.rs and then run `cargo
+check` to try parsing it, revealing the resulting syntax tree or else showing
+the position and error message if the input fails to parse.
diff --git a/syn/dev/main.rs b/syn/dev/main.rs
new file mode 100644
index 0000000..eb67546
--- /dev/null
+++ b/syn/dev/main.rs
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+syn_dev::r#mod! {
+    // Write Rust code here and run `cargo check` to have Syn parse it.
+
+}
diff --git a/syn/dev/parse.rs b/syn/dev/parse.rs
new file mode 100644
index 0000000..2a92550
--- /dev/null
+++ b/syn/dev/parse.rs
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+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::File;
+
+#[proc_macro]
+pub fn r#mod(input: TokenStream) -> TokenStream {
+    let compile_error = syn::parse::<File>(input)
+        .map(|file| println!("{:#?}", file))
+        .map_err(|err| err.to_compile_error())
+        .err();
+
+    TokenStream::from(quote! {
+        #compile_error
+        fn main() {}
+    })
+}