[ruby-core:74686] [Ruby trunk Bug#11871] Heredoc unindentation with <<~ with single-quoted identifier flush-lefts the content

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Issue #11871 has been updated by Yui NARUSE.

Backport changed from 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: REQUIRED to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: DONE

ruby_2_3 r54398 merged revision(s) 53398.

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Bug #11871: Heredoc unindentation with <<~ with single-quoted identifier flush-lefts the content
https://bugs.ruby-lang.org/issues/11871#change-57816

* Author: Tsuyoshi Sawada
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: DONE
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Heredoc unindentation with `<<~` works as expected when the identifier is bare or double-quoted:

~~~
s = <<~_
	fiwfewifjf
		iofwejfweifwe
			fjiofwejfweiof f
					fiwejfweof
	_

puts s
~~~

or

~~~
s = <<~"_"
	fiwfewifjf
		iofwejfweifwe
			fjiofwejfweiof f
					fiwejfweof
	_

puts s
~~~

Output:

~~~
fiwfewifjf
	iofwejfweifwe
		fjiofwejfweiof f
				fiwejfweof
~~~

But with a single-quoted identifier, the content is flushed left:

~~~
s = <<~'_'
	fiwfewifjf
		iofwejfweifwe
			fjiofwejfweiof f
					fiwejfweof
	_

puts s
~~~

Output:

~~~
fiwfewifjf
iofwejfweifwe
fjiofwejfweiof f
fiwejfweof
~~~



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