> In order to simplify everything, tabs are not allowed. Spaces are necessary; we can't ban spaces.

They seem to be open to the alternative but not to a solution that isn't forced on people:

> Maybe someday, we'll switch to tabs for indentation, spaces for alignment and make it a compile error if they are incorrectly mixed

Zig already has a builtin code formatter that automatically changes formatting to their preference, but that's not enough.

> That's the entire purpose of the concept of warning

Yes, but as far as I know the Zig compiler cannot emit warnings, only errors. Because warnings are potential footguns too and we can't have that.