Mini Shell

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

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: Set the scan pointer to the previous position. Only one previous position is remembered, and it changes with each scanning operation.
- !ruby/struct:SM::Flow::VERB 
  body: "  s = StringScanner.new('test string')\n  s.scan(/\\w+/)        # => "test"\n  s.unscan\n  s.scan(/../)         # => "te"\n  s.scan(/\\d/)         # => nil\n  s.unscan             # ScanError: unscan failed: previous match had failed\n"
full_name: StringScanner#unscan
is_singleton: false
name: unscan
params: ()
visibility: public