[ruby-core:74684] [Ruby trunk Bug#11976] Assigning to nil as a hash short-circuits without error.

Issue #11976 has been updated by Yui NARUSE.

Backport changed from 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: REQUIRED to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: DONE

ruby_2_3 r54396 merged revision(s) 53485.

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Bug #11976: Assigning to nil as a hash short-circuits without error.
https://bugs.ruby-lang.org/issues/11976#change-57813

* Author: Sergei Matheson
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin14]
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONTNEED, 2.3: DONE
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When assigning to nil as a hash, the RHS gets short-circuited, and the hash assignment on nil returns nil.
To reproduce:

~~~ruby
nil[:some_key] = undefined_method
# Expected: NameError: undefined local variable or method `undefined_method' for main:Object
# Actual: evaluates to nil. No errors raised.
~~~



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