[ruby-core:106174] [Ruby master Bug#18350] String with foreign character results in: TypeError (nil can't be coerced into Integer)

Issue #18350 has been reported by diadbrown (Dave Brown).

----------------------------------------
Bug #18350: String with foreign character results in: TypeError (nil can't be coerced into Integer)
https://bugs.ruby-lang.org/issues/18350

* Author: diadbrown (Dave Brown)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin17]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
``` ruby
2.7.2 :001 > s = "P炭rpura"
Traceback (most recent call last):
        7: from /Users/xxx/.rvm/rubies/ruby-2.7.2/bin/irb:23:in `<main>'
        6: from /Users/xxx/.rvm/rubies/ruby-2.7.2/bin/irb:23:in `load'
        5: from /Users/xxx/.rvm/rubies/ruby-2.7.2/lib/ruby/gems/2.7.0/gems/irb-1.2.6/exe/irb:11:in `<top (required)>'
        4: from /Users/xxx/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/reline/unicode.rb:99:in `calculate_width'
        3: from /Users/xxx/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/reline/unicode.rb:99:in `scan'
        2: from /Users/xxx/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/reline/unicode.rb:108:in `block in calculate_width'
        1: from /Users/xxx/.rvm/rubies/ruby-2.7.2/lib/ruby/2.7.0/reline/unicode.rb:108:in `+'
TypeError (nil can't be coerced into Integer)
2.7.2 :002 > 
```

Ruby 2.6.3 does not have this problem:
``` ruby
2.6.3 :001 > s = "P炭rpura"
 => "P炭rpura" 
2.6.3 :002 > 
```





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