refactor: remove pattern match in for comprehension

src/main/wacc/Main.scala

@@ -82,11 +82,7 @@ def frontend(
         (prog, renameErrors) <- renamer.rename(partialProg)
         _ = errors.addAll(renameErrors.toList)
         typedProg = typeChecker.check(prog, errors)
-
-        res = NonEmptyList.fromList(errors.result) match {
-          case Some(errors) => Left(errors)
-          case None         => Right(typedProg)
-        }
+        res = errors.result.toNel.toLeft(typedProg)
       } yield res
   }
 

src/main/wacc/frontend/renamer.scala

@@ -283,7 +283,6 @@ object renamer {
       allErrors <- toRename
         .zip(scope.subscopes(toRename.size))
         .parFoldMapA(renameFunction)
-      // .map(x => x.combineAll)
     } yield (Program(chunks.toList, main.body)(main.pos), globalErrors ++ allErrors)
   }