In the initial design,
would produce (a b c). In the spec-compliant rust version it produces ((a b) c). After using it for a bit, I think the reasons for wanting that are just too galaxy-brained. Cases where people wish it didn't do that are so much more common and the former design is generally easier to reason about. For instance, in the new design, this:
≠
I imagine most people would miss that, and they would wish that it would work, and they might not easily be able to figure out how to even express the first structure with the second indents.