[ruby-core:80987] [Ruby trunk Bug#13540] can't set length of shared string (RuntimeError) when interpolating __FILE__ in a heredoc

Issue #13540 has been reported by kylerippey (Kyle Rippey).

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Bug #13540: can't set length of shared string (RuntimeError) when interpolating __FILE__ in a heredoc
https://bugs.ruby-lang.org/issues/13540

* Author: kylerippey (Kyle Rippey)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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There appears to be a bug in Ruby 2.4.0 and 2.4.1 when interpolating `__FILE__` inside of a heredoc. In fact, no code in this file executes when this interpolation is present. Almost as if it's a syntax error, but it's reported as a RuntimeError.

~~~ ruby
# Works in Ruby 2.3 and 2.4
puts "#{__FILE__}"

# Works in Ruby 2.3 and 2.4
x = __FILE__
puts <<~HEREDOC
  #{x}
HEREDOC

# Works in Ruby 2.3
# Raises exception in Ruby 2.4: can't set length of shared string (RuntimeError)
puts <<~HEREDOC
  #{__FILE__}
HEREDOC
~~~



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