ToTokens refactor (#754)

Co-authored-by: Cameron Taggart <[email protected]>

Author: cataggar

services/autorust/codegen/examples/list_crates.rs

@@ -1,3 +1,4 @@
+#![allow(dead_code)]
 // cargo run --example list_crates
 // This list all crates that are generated.
 
@@ -54,7 +55,7 @@ fn list_crate_names() -> Result<Vec<String>> {
 }
 
 fn main() -> Result<()> {
-    let version = std::env::args().nth(1);
+    // let version = std::env::args().nth(1);
 
     let names = list_crate_names()?;
     // match &version {

services/autorust/codegen/src/autorust_toml.rs

@@ -5,6 +5,7 @@ use std::{collections::HashSet, fs};
 
 #[derive(Deserialize, Debug, Default)]
 pub struct PackageConfig {
+    #[serde(default)]
     pub tags_allow: Vec<String>,
 }
 impl<'a> PackageConfig {