diff --git a/schala-lang/language/src/schala.rs b/schala-lang/language/src/schala.rs
index 6f4f5ff..b479ece 100644
--- a/schala-lang/language/src/schala.rs
+++ b/schala-lang/language/src/schala.rs
@@ -129,13 +129,12 @@ fn format_parse_error(error: parsing::ParseError, handle: &mut Schala) -> String
 }
 
 fn symbol_table(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
-  handle.symbol_table.borrow_mut().add_top_level_symbols(&input).map(|()| {
-    comp.map(|comp| {
-      let debug = handle.symbol_table.borrow().debug_symbol_table();
-      comp.add_artifact(debug);
-    });
-    input
-  })
+  let () = handle.symbol_table.borrow_mut().add_top_level_symbols(&input)?;
+  comp.map(|comp| {
+    let debug = handle.symbol_table.borrow().debug_symbol_table();
+    comp.add_artifact(debug);
+  });
+  Ok(input)
 }
 
 fn typechecking(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {