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How would you go with matching `Add(left, Const(0))` to simplify it to `left`?

when { e is Add &amp;&amp; e.right == Const(0) -&gt; .... }

Pattern match is better for some type of code, but most of the time it is used just to match by type and that is what Kotlin’s `when` is better suited for.

with pattern match get yet another way to express your conditions (in addition to `if` and regular comparisons). These implicit comparisons do hurt redability.

That's very true and Kotlin being pragmatic lang I have a feeling you will not decide to implement matching.

For these rare uses when it makes it much cleaner to use PM.