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Bug #15780

Module#const_defined?(String) executes autoloads

Added by fxn (Xavier Noria) over 1 year ago. Updated 8 months ago.

Status:
Closed
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
[ruby-core:92351]

Description

The documentation of Module#const_defined? says that autoloads are not executed:

[...] if the constant is not present but there is an autoload for it, true is returned directly without autoloading.

While this seems to work as documented for symbols, constant names passed as strings trigger the autoload:

$ cat x.rb
p X = 1

$ cat foo.rb
Object.autoload("X", "x")
p Object.const_defined?("X")

$ ruby -I. foo.rb
1
true

Related issues

Is duplicate of Ruby master - Bug #10741: const_defined? triggers autoload where it did not beforeClosedActions

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