From: eileencodes@...
Date: 2021-07-20T19:41:34+00:00
Subject: [ruby-core:104656] [Ruby master Bug#18038] Invalid interpolation in	heredocs

Issue #18038 has been updated by eileencodes (Eileen Uchitelle).


I opened a PR here: https://github.com/ruby/ruby/pull/4664

I also confirmed that this is broken in the same way in Ruby 2.5, 2.6, and 2.7

----------------------------------------
Bug #18038: Invalid interpolation in heredocs
https://bugs.ruby-lang.org/issues/18038#change-92966

* Author: maciej.mensfeld (Maciej Mensfeld)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Given code as followed:

``` ruby
var = 1

v1 = <<~CMD
  something
  #{"/#{var}"}
CMD

v2 = <<~CMD
  something
  #{other = "/#{var}"}
CMD

v3 = <<~CMD
  something
  #{("/#{var}")}
CMD

p v1
p v2
p v3

p v1 == v2
p v2 == v3
```

result of running this:

```ruby
"something\n/\n"
"something\n/1\n"
"something\n/\n"
false
false
```

I would expect all heredocs to return the same value for all the cases. It seems the `other` variable assignment should be irrelevant but only with it the value "1" is present.




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