Split out the AST and codegen into the wasm-bindgen-backend crate

crates/backend/src/lib.rs

@@ -0,0 +1,25 @@
+#![recursion_limit = "128"]
+
+extern crate proc_macro2;
+#[macro_use]
+extern crate quote;
+#[macro_use]
+extern crate syn;
+
+extern crate wasm_bindgen_shared as shared;
+
+macro_rules! my_quote {
+    ($($t:tt)*) => (quote_spanned!(Span::call_site() => $($t)*))
+}
+
+pub mod ast;
+mod codegen;
+mod literal;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}