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std.Io: delete GenericWriter, AnyWriter, and null_writer #25036
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    | I'll work on updating  | 
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    These are some hastily made, untested changes to get things compiling again, since Ryan is working on a better upgrade patchset in the meantime.
perhaps these APIs have the defaults backwards, eh?
tracked by #25067 and I already have a fix cooking in another branch
I didn't notice the check+swap before.
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    There was some bug in this branch, and rather than diagnosing it, I fully finished porting over to new Reader API. Did it fix the bug?
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  This was referenced Aug 29, 2025 
      
      
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    breaking
  Implementing this issue could cause existing code to no longer compile or have different behavior. 
  
    release notes
  This PR should be mentioned in the release notes. 
  
    standard library
  This issue involves writing Zig code for the standard library. 
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Follow-up from #24329.
Also delete some delimiter methods from GenericReader.
These things were all deprecated in favor of the new concrete Reader and Writer APIs.