[ruby-core:108563] [Ruby master Bug#15790] Strange interaction between autoload and $LOADED_FEATURES

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


> The behaviour described here does not seem strange to me

What do you mean Samuel?

You don't find strange that we pass from "now autoload on X" to "there's an autoload for X", without having set an autoload for X in between? (No threads involved.)

----------------------------------------
Bug #15790: Strange interaction between autoload and $LOADED_FEATURES
https://bugs.ruby-lang.org/issues/15790#change-97602

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