diff --git a/ofborg/src/lib.rs b/ofborg/src/lib.rs
index da6fd36..1d8a20c 100644
--- a/ofborg/src/lib.rs
+++ b/ofborg/src/lib.rs
@@ -70,6 +70,19 @@ pub mod ofborg {
     pub use easyamqp;
 
     pub const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
+    pub fn partition_result<A,B>(results: Vec<Result<A,B>>) -> (Vec<A>, Vec<B>) {
+        let mut ok = Vec::new();
+        let mut err = Vec::new();
+        for result in results.into_iter() {
+            match result {
+                Ok(x) => { ok.push(x); }
+                Err(x) => { err.push(x); }
+            }
+        }
+
+        (ok, err)
+    }
 }
 
 pub fn setup_log() {
diff --git a/ofborg/src/nix.rs b/ofborg/src/nix.rs
index 4f2d8cb..91b78a2 100644
--- a/ofborg/src/nix.rs
+++ b/ofborg/src/nix.rs
@@ -8,6 +8,7 @@ use std::process::{Command, Stdio};
 use tempfile::tempfile;
 use std::io::BufReader;
 use std::io::BufRead;
+use ofborg::partition_result;
 
 #[derive(Clone, Debug)]
 pub enum Operation {
@@ -120,19 +121,7 @@ impl Nix {
             )
             .collect();
 
-        let (ok, err): (
-            Vec<Result<String, (String, Vec<String>)>>,
-            Vec<Result<String, (String, Vec<String>)>>)  = attr_instantiations
-            .into_iter()
-            .partition(|x| x.is_ok());
-
-        let ok_ret: Vec<String> = ok.into_iter().map(|x| x.unwrap()).collect();
-        let err_ret: Vec<(String, Vec<String>)> = err.into_iter().map(|x| x.unwrap_err()).collect();
-
-        return (
-            ok_ret,
-            err_ret
-        )
+        partition_result(attr_instantiations)
     }
 
     pub fn safely_instantiate_attrs(