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List: ruby-core
Subject: [ruby-core:92867] [Ruby trunk Bug#15877] Incorrect constant lookup result in method on cloned class
From: stephen.gregory () gmail ! com
Date: 2019-05-27 21:01:01
Message-ID: redmine.journal-78245.20190527210101.1d86f33bc4c12290 () ruby-lang ! org
[Download RAW message or body]
Issue #15877 has been updated by sag (Stephen Gregory).
I tested this on 2.5, 2.4 and the behavior is the same there. Also this applies to \
subclasses as well. The first class READ determines the values for all of them.
``` ruby
class Unrelated
TEST='UNRELATED'
def test
TEST
end
end
class Foo
def test
TEST
end
end
Bar2 = Foo.clone
Bar1 = Foo.clone
class Bar1
TEST = 'bar-1'
end
class Bar2
TEST = 'bar-2'
end
class Bar3 < Foo
TEST = 'bar-3'
end
puts "Bar2 #{Bar2.new.test}" # Bar2 bar-2
puts "Bar1 #{Bar1.new.test}" # Bar1 bar-2
puts "Bar3 #{Bar3.new.test}" # Bar3 bar-2
puts "Foo #{Foo.new.test}" # Foo bar-2
puts "Unrelated #{Unrelated.new.test}" #Unrelated UNRELATED
```
Interestingly if Bar3 is read first then you get:
```
sample/array_second.rb:12:in `test': uninitialized constant Foo::TEST (NameError)
from sample/array_second.rb:30:in `<main>'
```
----------------------------------------
Bug #15877: Incorrect constant lookup result in method on cloned class
https://bugs.ruby-lang.org/issues/15877#change-78245
* Author: danielwaterworth (Daniel Waterworth)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: 2.6.3
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This behavior seems wrong to me:
``` ruby
class Foo
def test
TEST
end
end
Bar1 = Foo.clone
Bar2 = Foo.clone
class Bar1
TEST = 'bar-1'
end
class Bar2
TEST = 'bar-2'
end
# If these two lines are reordered, 'bar-2' is produced each time
p [:bar1_method, Bar1.new.test] # outputs 'bar-1' (correct)
p [:bar2_method, Bar2.new.test] # outputs 'bar-1' (incorrect)
p [:bar1_const, Bar1::TEST] # outputs 'bar-1' (correct)
p [:bar2_const, Bar2::TEST] # outputs 'bar-2' (correct)
```
Possibly related to #9603, #7107
--
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