diff --git a/schala-repl/src/language.rs b/schala-repl/src/language.rs
index 34af586..d7bad6a 100644
--- a/schala-repl/src/language.rs
+++ b/schala-repl/src/language.rs
@@ -189,29 +189,29 @@ pub trait ProgrammingLanguageInterface {
   }
 }
 
-struct ComputationRequest {
+pub struct ComputationRequest {
   pub source: String,
   pub debug_requests: Vec<DebugRequest>,
 }
 
-struct ComputationResponse {
+pub struct ComputationResponse {
   pub main_output: Result<String, String>,
   pub global_output_stats: GlobalOutputStats,
   pub debug_responses: Vec<DebugResponse>,
 }
 
-struct DebugRequest {
+pub struct DebugRequest {
   kind: String,
   value: String
 }
 
-struct DebugResponse {
+pub struct DebugResponse {
   kind: String,
   value: String
 }
 
 #[derive(Default, Debug)]
-struct GlobalOutputStats {
+pub struct GlobalOutputStats {
   total_duration: Option<time::Duration>,
   stage_durations: Option<Vec<(String, time::Duration)>>
 }
diff --git a/schala-repl/src/lib.rs b/schala-repl/src/lib.rs
index 37c5e94..4d12354 100644
--- a/schala-repl/src/lib.rs
+++ b/schala-repl/src/lib.rs
@@ -39,8 +39,7 @@ pub fn start_repl(langs: Vec<Box<dyn ProgrammingLanguageInterface>>) {
     exit(0);
   }
 
-  let mut repl = repl::NewRepl::new();
-
+  let mut repl = repl::NewRepl::new(langs);
   repl.run_repl();
 }
 
diff --git a/schala-repl/src/repl/mod.rs b/schala-repl/src/repl/mod.rs
index 6f0aef0..7cbf2d3 100644
--- a/schala-repl/src/repl/mod.rs
+++ b/schala-repl/src/repl/mod.rs
@@ -16,16 +16,17 @@ const OPTIONS_SAVE_FILE: &'static str = ".schala_repl";
 pub struct NewRepl {
   interpreter_directive_sigil: char,
   line_reader: ::linefeed::interface::Interface<::linefeed::terminal::DefaultTerminal>,
+  language_states: Vec<Box<ProgrammingLanguageInterface>>,
 }
 
 impl NewRepl {
-  pub fn new() -> NewRepl {
+  pub fn new(languages: Vec<Box<ProgrammingLanguageInterface>>) -> NewRepl {
     use linefeed::Interface;
     let line_reader = Interface::new("schala-repl").unwrap();
     let interpreter_directive_sigil = ':';
 
     NewRepl {
-      interpreter_directive_sigil, line_reader,
+      interpreter_directive_sigil, line_reader, language_states
     }
   }