Commits on Jan 20, 2022

1. rustdoc: auto create output directory when "--output-format json" …

   This PR allows rustdoc to automatically create output directory in case
   it does not exist (when run with `--output-format json`).
   
   This fixes rustdoc crash:
   
   ````
   $ rustdoc --output-format json -Z unstable-options src/main.rs
   error: couldn't generate documentation: No such file or directory (os error 2)
     |
     = note: failed to create or modify "doc/main.json"
   
   error: aborting due to previous error
   ````
   
   With this fix behavior of `rustdoc --output-format json` becomes consistent
   with `rustdoc --output-format html` (which already auto-creates output
   directory if it's missing)

   

   tomkris committed Jan 20, 2022
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