Commits on Feb 12, 2021

1. [librustdoc] Reform lang string token splitting …

   Only split doctest lang strings on `,`, ` `, and `\t`. Additionally, to
   preserve backwards compatibility with pandoc-style langstrings, strip a
   surrounding `{}`, and remove leading `.`s from each token.
   
   Prior to this change, doctest lang strings were split on all
   non-alphanumeric characters except `-` or `_`, which limited future
   extensions to doctest lang string tokens, for example using `=` for
   key-value tokens.
   
   This is a breaking change, although it is not expected to be disruptive,
   because lang strings using separators other than `,` and ` ` are not
   very common

   

   casey committed Feb 12, 2021
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