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.....................................................................................................................................--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Upcases the contents of <em>str</em>, returning <tt>nil</tt> if no changes were made.
full_name: String#upcase!
is_singleton: false
name: upcase!
params: |
  str.upcase!   => str or nil

visibility: public