[ruby-core:98748] [Ruby master Feature#16952] Kernel.exec gives an incorrect error message when passed a script with a non-existing shebang

Issue #16952 has been updated by deivid (David Rodr刕uez).


In my opinion, the error message I'm being given is a bug, because it's telling me that a file the _does_ exist, doesn't exist. Ruby should double check if the file exists before giving that error message, and if it _does_ exist, give a more generic message that it's not clearly incorrect.

----------------------------------------
Feature #16952: Kernel.exec gives an incorrect error message when passed a script with a non-existing shebang
https://bugs.ruby-lang.org/issues/16952#change-86106

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
----------------------------------------
```
$ cat myscript.rb 
#!/bad/ruby/shebang

puts "Hei!"

$ ruby -e 'Kernel.exec("myscript.rb")'

Traceback (most recent call last):
	1: from -e:1:in `<main>'
-e:1:in `exec': No such file or directory - myscript.rb (Errno::ENOENT)
```

From the error, I understand that the script is not there, but the script is clearly there.

I would've expected something more similar to what you get if you try to run the script directly from the shell:

```
$ ./myscript.rb 
bash: ./myscript.rb: /bad/ruby/shebang: bad interpreter: No such file or directory
```



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