[ruby-core:96160] [Ruby master Bug#15780] Module#const_defined?(String) executes autoloads

Issue #15780 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.4: REQUIRED, 2.5: REQUIRED, 2.6: REQUIRED to 2.4: REQUIRED, 2.5: REQUIRED, 2.6: DONE

ruby_2_6 r67831 merged revision(s) 7d805e67f3275aef066d77aa9c32bef715c362ed.

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Bug #15780: Module#const_defined?(String) executes autoloads
https://bugs.ruby-lang.org/issues/15780#change-83038

* Author: fxn (Xavier Noria)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
* Backport: 2.4: REQUIRED, 2.5: REQUIRED, 2.6: DONE
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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
```



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