Fix IO#{autoclose=,autoclose?} and raise IOError when io is closed

Author: andrykonchin

CHANGELOG.md

@@ -35,6 +35,7 @@ Compatibility:
 * Joni has been updated from 2.1.44 to 2.2.1 (@andrykonchin).
 * Fix `Hash#to_h` called with a block and pass key and value to the block as separate arguments (#3607, @andrykonchin).
 * Fix `StringIO#initialize` and preserve initial string's encoding when mode is `w` so the initial string is truncated (#3599, @andrykonchin).
+* Fix `IO#{autoclose=,autoclose?}` and raise `IOError` when io is closed (@andrykonchin).
 
 Performance:
 

spec/tags/core/io/autoclose_tags.txt

@@ -908,10 +908,12 @@ def advise(advice, offset = 0, len = 0)
   # which is not really the owner of the fd should not actually close
   # the fd.
   def autoclose?
+    ensure_open
     @autoclose
   end
 
   def autoclose=(autoclose)
+    ensure_open
     @autoclose = Primitive.as_boolean(autoclose)
   end
 
@@ -2417,7 +2419,7 @@ def close
       if fd >= 0
         # Need to set even if the instance is frozen
         Primitive.io_set_fd(self, -1)
-        if fd >= 3 && autoclose?
+        if fd >= 3 && @autoclose
           ret = Truffle::POSIX.close(fd)
           Errno.handle if ret < 0
         end