diff --git a/schala-lib/src/language.rs b/schala-lib/src/language.rs
index 3123721..f554b4b 100644
--- a/schala-lib/src/language.rs
+++ b/schala-lib/src/language.rs
@@ -16,12 +16,12 @@ pub struct EvalOptions {
 }
 
 #[derive(Debug, Default)]
-pub struct ReplOutput {
+pub struct LanguageOutput {
   output: String,
   artifacts: Vec<TraceArtifact>
 }
 
-impl ReplOutput {
+impl LanguageOutput {
   pub fn add_artifact(&mut self, artifact: TraceArtifact) {
     self.artifacts.push(artifact);
   }
@@ -90,7 +90,7 @@ impl TraceArtifact {
 }
 
 pub trait ProgrammingLanguageInterface {
-  fn evaluate_in_repl(&mut self, input: &str, eval_options: &EvalOptions) -> ReplOutput;
+  fn evaluate_in_repl(&mut self, input: &str, eval_options: &EvalOptions) -> LanguageOutput;
   fn get_language_name(&self) -> String;
   fn get_source_file_suffix(&self) -> String;
   fn compile(&mut self, _input: &str) -> LLVMCodeString {
diff --git a/schala-lib/src/lib.rs b/schala-lib/src/lib.rs
index 5b55adf..260183a 100644
--- a/schala-lib/src/lib.rs
+++ b/schala-lib/src/lib.rs
@@ -32,7 +32,7 @@ pub mod llvm_wrap;
 
 include!(concat!(env!("OUT_DIR"), "/static.rs"));
 
-pub use language::{ProgrammingLanguageInterface, EvalOptions, ReplOutput, TraceArtifact, LLVMCodeString};
+pub use language::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, LanguageOutput, LLVMCodeString};
 pub type PLIGenerator = Box<Fn() -> Box<ProgrammingLanguageInterface> + Send + Sync>;
 
 pub fn schala_main(generators: Vec<PLIGenerator>) {
@@ -110,7 +110,9 @@ fn run_noninteractive(filename: &str, languages: Vec<Box<ProgrammingLanguageInte
       compilation_sequence(llvm_bytecode, filename);
     }
   } else {
-    language.evaluate_in_repl(&buffer, &options);
+    let output = language.evaluate_in_repl(&buffer, &options);
+    // if output.has_error....
+
   }
 }
 
diff --git a/source_files/schala/first.schala b/source_files/schala/first.schala
index a56eac9..fd653ab 100644
--- a/source_files/schala/first.schala
+++ b/source_files/schala/first.schala
@@ -6,3 +6,5 @@ fn main() {
 
 print(main())
 
+const xxx
+
diff --git a/src/maaru_lang/mod.rs b/src/maaru_lang/mod.rs
index 1affe00..37ab100 100644
--- a/src/maaru_lang/mod.rs
+++ b/src/maaru_lang/mod.rs
@@ -3,7 +3,7 @@ pub mod parser;
 pub mod eval;
 pub mod compilation;
 
-use schala_lib::{ProgrammingLanguageInterface, EvalOptions, ReplOutput, TraceArtifact, LLVMCodeString};
+use schala_lib::{ProgrammingLanguageInterface, EvalOptions, LanguageOutput, TraceArtifact, LLVMCodeString};
 
 #[derive(Debug)]
 pub struct TokenError {
@@ -38,8 +38,8 @@ impl<'a> ProgrammingLanguageInterface for Maaru<'a> {
     format!("maaru")
   }
 
-  fn evaluate_in_repl(&mut self, input: &str, options: &EvalOptions) -> ReplOutput {
-    let mut output = ReplOutput::default();
+  fn evaluate_in_repl(&mut self, input: &str, options: &EvalOptions) -> LanguageOutput {
+    let mut output = LanguageOutput::default();
 
     let tokens = match tokenizer::tokenize(input) {
       Ok(tokens) => {
diff --git a/src/robo_lang/mod.rs b/src/robo_lang/mod.rs
index d37404c..73be23a 100644
--- a/src/robo_lang/mod.rs
+++ b/src/robo_lang/mod.rs
@@ -1,5 +1,5 @@
 use itertools::Itertools;
-use schala_lib::{ProgrammingLanguageInterface, EvalOptions, ReplOutput};
+use schala_lib::{ProgrammingLanguageInterface, EvalOptions, LanguageOutput};
 
 pub struct Robo {
 }
@@ -150,8 +150,8 @@ impl ProgrammingLanguageInterface for Robo {
     format!("robo")
   }
 
-  fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> ReplOutput {
-    let mut output = ReplOutput::default();
+  fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> LanguageOutput {
+    let mut output = LanguageOutput::default();
     let tokens = match tokenize(input) {
       Ok(tokens) => tokens,
       Err(e) => {
diff --git a/src/rukka_lang/mod.rs b/src/rukka_lang/mod.rs
index 499fb24..0118063 100644
--- a/src/rukka_lang/mod.rs
+++ b/src/rukka_lang/mod.rs
@@ -1,5 +1,5 @@
 use itertools::Itertools;
-use schala_lib::{ProgrammingLanguageInterface, EvalOptions, ReplOutput};
+use schala_lib::{ProgrammingLanguageInterface, EvalOptions, LanguageOutput};
 use std::iter::Peekable;
 use std::vec::IntoIter;
 use std::str::Chars;
@@ -68,8 +68,8 @@ impl ProgrammingLanguageInterface for Rukka {
     format!("rukka")
   }
 
-  fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> ReplOutput {
-    let mut output = ReplOutput::default();
+  fn evaluate_in_repl(&mut self, input: &str, _eval_options: &EvalOptions) -> LanguageOutput {
+    let mut output = LanguageOutput::default();
     let sexps = match read(input) {
       Err(err) => {
         output.add_output(format!("Error: {}", err));
diff --git a/src/schala_lang/mod.rs b/src/schala_lang/mod.rs
index 5ebadcc..0bbc76e 100644
--- a/src/schala_lang/mod.rs
+++ b/src/schala_lang/mod.rs
@@ -1,5 +1,5 @@
 use itertools::Itertools;
-use schala_lib::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, ReplOutput};
+use schala_lib::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, LanguageOutput};
 
 macro_rules! bx {
   ($e:expr) => { Box::new($e) }
@@ -37,8 +37,8 @@ impl ProgrammingLanguageInterface for Schala {
     format!("schala")
   }
 
-  fn evaluate_in_repl(&mut self, input: &str, options: &EvalOptions) -> ReplOutput {
-    let mut output = ReplOutput::default();
+  fn evaluate_in_repl(&mut self, input: &str, options: &EvalOptions) -> LanguageOutput {
+    let mut output = LanguageOutput::default();
     let tokens = tokenizing::tokenize(input);
     if options.debug_tokens {
       let token_string = tokens.iter().map(|t| format!("{:?}<L:{},C:{}>", t.token_type, t.offset.0, t.offset.1)).join(", ");