From: naruse@...
Date: 2021-02-01T15:12:21+00:00
Subject: [ruby-core:102360] [Ruby master Bug#17547] Fix `Ripper.lex("a <<b")`

Issue #17547 has been updated by naruse (Yui NARUSE).

Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED to 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 17986daf6edd00313c2a2fe4d2dfccb4f1472977 merged revision(s) b84b253a69537a14e4854e17b6d94ae75c2af050.

----------------------------------------
Bug #17547: Fix `Ripper.lex("a <<b")`
https://bugs.ruby-lang.org/issues/17547#change-90221

* Author: osyo (manga osyo)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]
* Backport: 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
`Ripper.lex("a <<b")` was not parsed correctly.

```ruby
require "ripper"

p Ripper.lex("a <<b")
# Expected behavior => [[[1, 0], :on_ident, "a", CMDARG], [[1, 1], :on_sp, " ", CMDARG], [[1, 2], :on_heredoc_beg, "<<b", CMDARG]]
# Actual behavior   => [[[1, 2], :on_heredoc_beg, "<<b", CMDARG]]
```

PR: https://github.com/ruby/ruby/pull/4083




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