This tweaks the number of spaces before each token to create a consistent
layout. It doesn't (yet?) attempt to add or remove line breaks or
otherwise mess with the non-space characters in the code.
The main goal here is to get things to line up. zcl syntax is simple
enough that there's not much latitude for super-weird usage, and so if
someone does manage to write something weird (asymmetric breaking of
brackets between lines, etc) we won't try to fix it here.
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