diff --git a/schala-lang/src/lib.rs b/schala-lang/src/lib.rs
index e6a5c2d..0c580fb 100644
--- a/schala-lang/src/lib.rs
+++ b/schala-lang/src/lib.rs
@@ -91,13 +91,17 @@ fn symbol_table(handle: &mut Schala, input: parsing::AST, comp: Option<&mut Unfi
 fn typechecking(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<parsing::AST, String> {
   match handle.type_context.type_check_ast(&input) {
     Ok(ty) => {
-      comp.map(|c| c.add_artifact(TraceArtifact::new("type_table", format!("{}", handle.type_context.debug_types()))));
-      comp.map(|c| c.add_artifact(TraceArtifact::new("type_check", format!("{:?}", ty))));
+      comp.map(|c| {
+        c.add_artifact(TraceArtifact::new("type_table", format!("{}", handle.type_context.debug_types())));
+        c.add_artifact(TraceArtifact::new("type_check", format!("{:?}", ty)));
+      });
       Ok(input)
     },
     Err(msg) => {
-      comp.map(|comp| comp.add_artifact(TraceArtifact::new("type_table", format!("{}", handle.type_context.debug_types()))));
-      comp.map(|comp| comp.add_artifact(TraceArtifact::new("type_check", format!("Type error: {:?}", msg))));
+      comp.map(|comp| {
+        comp.add_artifact(TraceArtifact::new("type_table", format!("{}", handle.type_context.debug_types())));
+        comp.add_artifact(TraceArtifact::new("type_check", format!("Type error: {:?}", msg)));
+      });
       Ok(input)
     }
   }