Bug #21027: `not()` receiver should be `nil`

• Status: Closed
• Assignee: prism
• Target version: -
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED

[kddnewton (Kevin Newton)]

not has a 0-argument mode, and the behavior differs from that of parse.y:

% RBENV_VERSION=3.4.0 ruby --parser=parse.y -e 'p not()'
true
% RBENV_VERSION=3.4.0 ruby --parser=prism -e 'p not()'
false

This is because Prism interprets not() as self.! where parse.y interprets it as nil.!.

[kddnewton (Kevin Newton)]

• Backport changed from 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED

[kddnewton (Kevin Newton)]

• Status changed from Open to Closed

Applied in changeset git|117d6e145a0270ab8fc9134403519ef13b9ebb24.

---

[ruby/prism] Fix not receiver

not foo should be !foo
not() should be !nil

Fixes [Bug #21027]

https://github.com/ruby/prism/commit/871ed4b462