diff --git a/.circleci/config.yml b/.circleci/config.yml
index d802392b5..02ec9bf67 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -455,8 +455,6 @@ jobs:
   package_vm:
     docker:
       - image: rust:1.74
-    environment:
-      CARGO_INCREMENTAL: "0"
     steps:
       - checkout
       - run:
diff --git a/packages/vm-derive-impl/src/hash_function.rs b/packages/vm-derive-impl/src/hash_function.rs
index abc5a2c35..2475b049e 100644
--- a/packages/vm-derive-impl/src/hash_function.rs
+++ b/packages/vm-derive-impl/src/hash_function.rs
@@ -12,6 +12,7 @@ pub fn hash_function_impl(attr: TokenStream, input: TokenStream) -> TokenStream
     let _: syn::ItemFn = maybe!(syn::parse2(input.clone()));
 
     let display = input.to_string();
+    panic!("display: {:?}", display);
     let hex_hash = blake3::hash(display.as_bytes()).to_hex();
     let hex_hash = hex_hash.as_str();
 
diff --git a/packages/vm-derive/src/lib.rs b/packages/vm-derive/src/lib.rs
index 8821ad262..09d8cf45b 100644
--- a/packages/vm-derive/src/lib.rs
+++ b/packages/vm-derive/src/lib.rs
@@ -1,9 +1,11 @@
+use std::fmt::Debug;
+
 pub struct Hash(pub &'static str);
 
 inventory::collect!(Hash);
 
 #[inline]
-pub fn collect_hashes() -> impl Iterator<Item = &'static str> {
+pub fn collect_hashes() -> impl Iterator<Item = &'static str> + Debug {
     let mut hashes = inventory::iter::<Hash>
         .into_iter()
         .map(|hash| hash.0)