RDoc::Parser::Ruby failure on class paths with line breaks

[driskell]

The easiest reproducing case for this is:

print String::
  new('test')

This is valid Ruby. However, not for rdoc.

$ ruby test.rb
test

$ rdoc
Parsing sources...
100% [ 1/ 1]  test.rb
RDoc::Parser::Ruby failure around line 2 of
test.rb

  new('test')

Before reporting this, could you check that the file you're documenting
has proper syntax:

  /Users/Jason/.rvm/rubies/ruby-2.5.1/bin/ruby -c test.rb

RDoc is not a full Ruby parser and will fail when fed invalid ruby programs.

The internal error was:

	(RDoc::Error) Invalid class or module definition: String

uh-oh! RDoc had a problem:
Invalid class or module definition: String

run with --debug for full backtrace

Versions:

$ ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
$ rdoc --version
6.2.0