diff --git a/schala-lang/language/src/schala.rs b/schala-lang/language/src/schala.rs
index fc48dca..11e428f 100644
--- a/schala-lang/language/src/schala.rs
+++ b/schala-lang/language/src/schala.rs
@@ -2,7 +2,6 @@ use stopwatch::Stopwatch;
 
 use std::cell::RefCell;
 use std::rc::Rc;
-use std::collections::HashSet;
 
 use schala_repl::{ProgrammingLanguageInterface,
 ComputationRequest, ComputationResponse,
@@ -58,15 +57,13 @@ impl Schala {
   /// Schala code in the file `prelude.schala`
   pub fn new() -> Schala {
     let prelude = include_str!("prelude.schala");
-    let mut s = Schala::new_blank_env();
+    let mut env = Schala::new_blank_env();
 
-    //TODO this shouldn't depend on schala-repl types
-    let request = ComputationRequest { source: prelude, debug_requests: HashSet::default() };
-    let response = s.run_computation(request);
-    if let Err(msg) = response.main_output {
+    let response = env.run_pipeline(prelude);
+    if let Err(msg) = response {
       panic!("Error in prelude, panicking: {}", msg);
     }
-    s
+    env
   }
 
   /// This is where the actual action of interpreting/compilation happens.
@@ -174,7 +171,7 @@ fn stage_names() -> Vec<&'static str> {
 
 
 impl ProgrammingLanguageInterface for Schala {
-  type Options = ();
+  type Config = ();
   fn language_name() -> String {
     "Schala".to_owned()
   }
@@ -183,8 +180,8 @@ impl ProgrammingLanguageInterface for Schala {
     "schala".to_owned()
   }
 
-  fn run_computation(&mut self, request: ComputationRequest) -> ComputationResponse {
-    let ComputationRequest { source, debug_requests: _ } = request;
+  fn run_computation(&mut self, request: ComputationRequest<Self::Config>) -> ComputationResponse {
+    let ComputationRequest { source, debug_requests: _, config: _ } = request;
     self.source_reference.load_new_source(source);
     let sw = Stopwatch::start_new();
 
diff --git a/schala-repl/src/language.rs b/schala-repl/src/language.rs
index b7923a0..cd5d28f 100644
--- a/schala-repl/src/language.rs
+++ b/schala-repl/src/language.rs
@@ -2,11 +2,11 @@ use std::collections::HashSet;
 use std::time;
 
 pub trait ProgrammingLanguageInterface {
-    type Options;
+    type Config: Default;
     fn language_name() -> String;
     fn source_file_suffix() -> String;
 
-    fn run_computation(&mut self, _request: ComputationRequest) -> ComputationResponse;
+    fn run_computation(&mut self, _request: ComputationRequest<Self::Config>) -> ComputationResponse;
 
     fn request_meta(&mut self, _request: LangMetaRequest) -> LangMetaResponse {
         LangMetaResponse::Custom {
@@ -23,9 +23,9 @@ struct Options<T> {
 }
 */
 
-pub struct ComputationRequest<'a> {
+pub struct ComputationRequest<'a, T> {
     pub source: &'a str,
-    //pub options: Options<()>,
+    pub config: T,
     pub debug_requests: HashSet<DebugAsk>,
 }
 
diff --git a/schala-repl/src/lib.rs b/schala-repl/src/lib.rs
index f738484..6d4cdf4 100644
--- a/schala-repl/src/lib.rs
+++ b/schala-repl/src/lib.rs
@@ -187,6 +187,7 @@ impl<L: ProgrammingLanguageInterface> Repl<L> {
 
         let request = ComputationRequest {
             source: input,
+            config: Default::default(),
             debug_requests,
         };
         let response = self.language_state.run_computation(request);
diff --git a/src/main.rs b/src/main.rs
index fe151e2..af17153 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -52,6 +52,7 @@ pub fn run_noninteractive<L: ProgrammingLanguageInterface>(filenames: Vec<PathBu
 
     let request = ComputationRequest {
         source: &buffer,
+        config: Default::default(),
         debug_requests: HashSet::new(),
     };