diff --git a/schala-lang/language/src/lib.rs b/schala-lang/language/src/lib.rs
index 22bf991..e9001ca 100644
--- a/schala-lang/language/src/lib.rs
+++ b/schala-lang/language/src/lib.rs
@@ -248,12 +248,12 @@ impl ProgrammingLanguageInterface for Schala {
   fn run_computation(&mut self, request: ComputationRequest) -> ComputationResponse {
     let ComputationRequest { source, debug_requests } = request;
 
-    let mut token_debug_artifact = None;
-    let mut parsing_debug_artifact = None;
-    let mut symbol_debug_artifact = None;
-    let mut typechecking_debug_artifact = None;
-    let mut reducing_debug_artifact = None;
-    let mut eval_debug_artifact = None;
+    let token_debug_artifact = None;
+    let parsing_debug_artifact = None;
+    let symbol_debug_artifact = None;
+    let typechecking_debug_artifact = None;
+    let reducing_debug_artifact = None;
+    let eval_debug_artifact = None;
 
     self.source_reference.load_new_source(source);
     let main_output: Result<String, String> = tokenizing(source, self, token_debug_artifact)