feat(codegen): various improvements to robustness

torn-api/build.rs

@@ -28,4 +28,8 @@ fn main() {
     let scopes_file = syn::parse2(resolved.codegen_scopes()).unwrap();
     let scopes_pretty = prettyplease::unparse(&scopes_file);
     fs::write(&scopes_dest, scopes_pretty).unwrap();
+
+    for warning in resolved.warnings.get_warnings() {
+        println!("cargo:warning={}", warning);
+    }
 }