Design patterns for composability with traits (i.e. typeclasses)?

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I agree with much of the logic against including the ternary operator, but only if if-else isn't forcing that noisy brace-delimited syntax:

if !prev { cur } else { prev + cur }

I'd prefer:

if !prev: cur else prev + cur

Or even more clear:

if !prev then cur else prev + cur

Than:

!prev ? cur : prev + cur

But remove syntax coloring and assume we are using a plain text editor:

if !prev { cur } else { prev + cur } <--- this style isn't available in a Haskell/Python block indenting instead of brace-delimited

if !prev: cur else prev + cur

if !prev then cur else prev + cur

Then the English text variants render low contrast confusing the keywords and the adjacent juxtaposed fragments of code, thus we either need the brace-delimited or the operator delimited ternary:

!prev ? cur : prev + cur

Edit: I added a comment at the issue tracker linking to this post.

Edit#2: I'm thinking the best would be to force only ternary on single or double line if and if-else:

!prev ? cur
!prev ? cur : prev + cur

!prev ? cur
      : prev + cur

But I'm not sure if I prefer that compared to:

if !prev: cur

if !prev: cur else prev + cur

if !prev: cur
else prev + cur

Or:

if (!prev) cur

if (!prev) cur else prev + cur

if (!prev) cur
else prev + cur

Or:

if !prev then cur

if !prev then cur else prev + cur

if !prev then cur
else prev + cur

Then for multi-line blocks either brace-delimited or my preferred indented delimited with keywords:

if !prev {
   cur
}
else {
   prev + cur
}

if !prev
   cur
else
   prev + cur