Tantrum is not tied to exceptions. Tantrum is the style of C programs. Remove the word exceptions out of the constraints. Make the example program exactly the same as the next.

22-tantrum/README.md

@@ -5,10 +5,10 @@ Constraints:
 
 - Every single procedure and function checks the sanity of its
   arguments and refuses to continue when the arguments are
-  unreasonable, throwing an exception
+  unreasonable
 
-- All code blocks check for all possible errors, print out
-  context-specific messages when errors occur, and pass the exceptions
+- All code blocks check for all possible errors, possibly print out
+  context-specific messages when errors occur, and pass the errors
   up the function call chain
 
 Possible names: