Issue #15790 has been reported by fxn (Xavier Noria).

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Bug #15790: Strange interaction between autoload and $LOADED_FEATURES
https://bugs.ruby-lang.org/issues/15790

* Author: fxn (Xavier Noria)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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If an autoload fails and we remove its associated file from `$LOADED_FEATURES`, the autoload is back:

```
$ cat x.rb
Y = 1 # should be X, emulates a typo

$ cat test.rb
def au
  Object.autoload?(:X).inspect
end

x_rb = File.realpath("x.rb")
autoload :X, x_rb

puts "before failed autoload autoload path is #{au}"

X rescue nil

puts "after failed autoload autoload path is #{au}"

$LOADED_FEATURES.delete(x_rb)

puts "after $LOADED_FEATURES deletion autoload path is #{au}"
```

The output is

```
$ ruby -v test.rb
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
before failed autoload autoload path is "/Users/fxn/tmp/x.rb"
after failed autoload autoload path is nil
after $LOADED_FEATURES deletion autoload path is "/Users/fxn/tmp/x.rb"
```

See? Last line would be expected to print a `nil` autoload path.



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