Confusing error message for missing `else` clause in if/then/else statements

If you are a new user of Unison, you might - in error, terminate your if/then/else clause with a "todo" like so if not (startsWith t rem) then Left (Expected t) todo "WIP" from the handler snippet included below. This produces the following error message:

  I don't know about any ability constructor named Parse.take. Maybe make sure it's correctly
  spelled and that you've imported it:
  
     82 |       {Parse.take n -> resume} ->
  I don't know about any data constructor named Parse.take. Maybe make sure it's correctly spelled
  and that you've imported it:
  
     82 |       {Parse.take n -> resume} ->
   

Or, to reduce the problem further, in a scratch file you might just forgetfully leave out the else clause altogether

val myWip = if true then "HI" 
nextVal = 4

Which will produce the error:

  /Users/rebeccamark/Unison/my-unison-work/parser.u:18:9:
  unexpected =
     18 | nextVal = 4

If possible, it might be nice if the error message mentioned something about the missing else statement as this may be a common slip of the hand.

For reference, the original code that generated the Parse.take error message is below:

Parse.run : '{Parse err} a -> Text -> Either err a
Parse.run p rem = 
  h : Text -> Position -> Request {Parse err} a -> Either (Parse.Error err) a 
  h rem pos = cases
      {Parse.take n -> resume} ->
        a = Text.take n rem 
        handle resume a with h (drop n rem) 
      {Parse.skip n -> resume} -> 
        handle resume () with h (drop n rem)
      {Parse.text t -> resume} -> 
	if not (startsWith t rem) then Left (Expected t) todo "WIP"

  handle !p with h rem (Position 0)

My unison version is a trunk version that is a few days old: devel/M1l-1068-gb0dd6e549 so I'm happy to re-pull and re-test if need be.