chore: add some more debugging to forge bind

crates/sol-macro-gen/src/sol_macro_gen.rs

@@ -139,27 +139,28 @@ edition = "2021"
         )?;
 
         // Write src
+        let parse_error = |name: &str| {
+            format!("failed to parse generated tokens as an AST for {name};\nthis is likely a bug")
+        };
         for instance in &self.instances {
-            let name = instance.name.to_lowercase();
-            let contents = instance.expansion.as_ref().unwrap().to_string();
+            let contents = instance.expansion.as_ref().unwrap();
 
-            if !single_file {
-                let path = src.join(format!("{name}.rs"));
-                let file = syn::parse_file(&contents)?;
-                let contents = prettyplease::unparse(&file);
-
-                fs::write(path.clone(), contents).wrap_err("Failed to write file")?;
-                writeln!(&mut lib_contents, "pub mod {name};")?;
-            } else {
+            let name = instance.name.to_lowercase();
+            let path = src.join(format!("{name}.rs"));
+            let file = syn::parse2(contents.clone())
+                .wrap_err_with(|| parse_error(&format!("{}:{}", path.display(), name)))?;
+            let contents = prettyplease::unparse(&file);
+            if single_file {
                 write!(&mut lib_contents, "{contents}")?;
+            } else {
+                fs::write(path, contents).wrap_err("failed to write to file")?;
+                writeln!(&mut lib_contents, "pub mod {name};")?;
             }
         }
 
         let lib_path = src.join("lib.rs");
-        let lib_file = syn::parse_file(&lib_contents)?;
-
+        let lib_file = syn::parse_file(&lib_contents).wrap_err_with(|| parse_error("lib.rs"))?;
         let lib_contents = prettyplease::unparse(&lib_file);
-
         fs::write(lib_path, lib_contents).wrap_err("Failed to write lib.rs")?;
 
         Ok(())