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This list item is a language-level proposal, not an API change, so you would think there would be no package dependency mention here. Well, turns out Dartlin provides if, when, and try as expressions via functions. I won't delve much into how it works but if you are curious (I know you are), check out the readme for more details. This is also possibly the biggest change of the bunch because it introduces this concept of implicitly returning the last expression on the block of these statements, but I believe it's quite intuitive to pick up and would make a good addition as well.
The great news about this one item list as well is that these are just proposals to add functions to the SDK, which, as we already learned, can be easily done with extension functions. That is where Dartlin comes to rescue again, providing all the aforementioned functions (with the Kotlin nomenclature) and even more (like the handy associate or groupBy). Another useful bit of code can be found on my ordered_set package's Comparing class, to be used alongside functions that take sorting orders. So you can get all these goodies right now, but would be even better to have them standardized into the SDK.