Adding an operator like Haskell's '$'

The title says it all, I'm thinking it would be useful for eg.
```nix
builtins.trace "my debug stuff" $
# some multiline complex code that would require parenthesing otherwise
```

What do you think about it? I guess it's too late for the feature freeze, but $ being already reserved for ${} I guess it wouldn't be a breaking change anyway.