[ruby-core:83343] [Ruby trunk Bug#14027] Ripper parses squiggly heredoc incorrectly

Issue #14027 has been reported by mjago (Martyn Jago).

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Bug #14027: Ripper parses squiggly heredoc incorrectly
https://bugs.ruby-lang.org/issues/14027

* Author: mjago (Martyn Jago)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-10-18 trunk 60205) [x86_64-darwin13]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
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Where you have two or more embedded expressions on the same line within a squiggly heredoc
seperated by whitespace, Ripper considers that whitespace as ignored space despite it not being at the
beginning of a line. Below is a diff of lexer output between identical heredoc and squiggly heredoc to highlight:

~~~ diff
 [[[1, 0], :on_ignored_nl, "\n", EXPR_BEG],
- [[2, 0], :on_heredoc_beg, "<<-E", EXPR_BEG],
+ [[2, 0], :on_heredoc_beg, "<<~E", EXPR_BEG],
  [[2, 4], :on_nl, "\n", EXPR_BEG],
  [[3, 0], :on_embexpr_beg, "\#{", EXPR_BEG],
  [[3, 2], :on_int, "3", EXPR_END|EXPR_ENDARG],
  [[3, 3], :on_embexpr_end, "}", EXPR_END],
- [[3, 4], :on_tstring_content, " ", EXPR_BEG],
+ [[3, 4], :on_ignored_sp, " ", EXPR_BEG],
  [[3, 5], :on_embexpr_beg, "\#{", EXPR_BEG],
  [[3, 7], :on_sp, " ", EXPR_BEG],
  [[3, 8], :on_int, "4", EXPR_END|EXPR_ENDARG],
  [[3, 9], :on_sp, " ", EXPR_END|EXPR_ENDARG],
  [[3, 10], :on_embexpr_end, "}", EXPR_END],
  [[3, 11], :on_tstring_content, "\n", EXPR_BEG],
  [[4, 0], :on_heredoc_end, "E", EXPR_BEG]]
~~~

Also the sexp shows the whitespace as an empty string:

~~~ diff
 [:program,
  [[:string_literal,
    [:string_content,
     [:string_embexpr, [[:@int, "1", [2, 2]]]],
-    [:@tstring_content, "   ", [2, 4]],
+    [:@tstring_content, "", [2, 7]],
     [:string_embexpr, [[:@int, "2", [2, 9]]]],
     [:@tstring_content, "\n", [2, 11]]]]]]
~~~
This can be seen on head, 2.4.2, and 2.3.5

Scripts used:
```
ruby -rripper -rpp -e '%{<<-E\n\#{1} \#{2}\nE}'
ruby -rripper -rpp -e '%{<<~E\n\#{1} \#{2}\nE}'
```




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