self.save, a paren-less save and save(x) with no receiver all send to
the current object, but they went through the file-wide name map,
which keeps only the last definition of each name, so they landed on
whichever class the file declares last, as EXTRACTED. In sinatra's
base.rb, Helpers#not_found was wired to Base#error and
AcceptEntry#to_s to MimeTypeEntry#to_str.
Route them through _self_call_target with the in-file inherits walk.
A top-level def and a mixed-in module method are not methods of an
unrelated class, so implicit-self sends to them resolve as before.
(cherry picked from commit 0175b64783)
Cintu07
74fa51026b