[ruby-core:92673] [Ruby trunk Bug#15839] mixed encoding heredoc should be a syntax error regardless the order

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Issue #15839 has been updated by jeremyevans0 (Jeremy Evans).

File mixed-encoding-heredoc-fix-v2.patch added

After additional analysis, I found that I only needed to add one line to my initial patch to fix it to work with both `\u` before `\x` and `\u` after `\x`.  With the attached patch (which supersedes the previous patches):

```
$ ruby -e '#encoding: cp932
p((<<-STR))
\u1234
\xe9\x9d
STR
'
-e:4: UTF-8 mixed within Windows-31J source
\xe9\x9d

$ ruby -e '#encoding: cp932
p((<<-STR))
\xe9\x9d
\u1234
STR
'
-e:4: UTF-8 mixed within Windows-31J source
\u1234
-e:2: syntax error, unexpected end-of-input, expecting literal content or terminator or tSTRING_DBEG or tSTRING_DVAR
```

----------------------------------------
Bug #15839: mixed encoding heredoc should be a syntax error regardless the order
https://bugs.ruby-lang.org/issues/15839#change-78036

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: REQUIRED, 2.5: REQUIRED, 2.6: REQUIRED
----------------------------------------
This heredoc isn't a syntax error,
```ruby
#encoding: cp932

p <<-STR
\xe9\x9d
\u1234
STR
```

whereas this is.
```ruby
#encoding: cp932
"
\xe9\x9d
\u1234
"
```

---Files--------------------------------
mixed-encoding-heredoc-fix.patch (5.28 KB)
mixed-encoding-heredoc-reverse-order-fix.patch (1.58 KB)
mixed-encoding-heredoc-fix-v2.patch (5.64 KB)


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