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call-seq:
terminate -> self
Sets the scanner to end-of-string;
returns +self+:
- Sets both [positions][11] to end-of-stream.
- Clears [match values][9].
```rb
scanner = StringScanner.new(HIRAGANA_TEXT)
scanner.string # => "こんにちは"
scanner.scan_until(/に/)
put_situation(scanner)
# Situation:
# pos: 9
# charpos: 3
# rest: "ちは"
# rest_size: 6
match_values_cleared?(scanner) # => false
scanner.terminate # => #<StringScanner fin>
put_situation(scanner)
# Situation:
# pos: 15
# charpos: 5
# rest: ""
# rest_size: 0
match_values_cleared?(scanner) # => true
```
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