when they aren't caught.
I could have an 'else' on any simple statement which does error handling
+
+
+Maybe a type that starts '?' can fail to have a value.
+
+foo: ?int
+
+ foo = 27/0
+
+ would not trigger an error, but you need
+ if ?foo: print foo; else print "div by zero"
+ to use the value
+
+ Most operators will let an error fall through if it is expected.
+
+ If you want details about the error, you need to declare a type that
+ holds a value or an error. You then get the error code with foo.err or whatever
+ you have defined.