From @moritz

$ echo -n foo > test
$ perl6 -e 'my $f = open("test"); say $f.slurp'
foo
$ perl6 -e 'my $f = open("test"); .say for $f.lines'
Unable to open filehandle from path 'test'
  in method open at src/gen/CORE.setting​:6268
  in method get at src/gen/CORE.setting​:6288
  in code <anon> at src/gen/CORE.setting​:6313
  in sub coro at src/gen/CORE.setting​:4797
  in method reify at src/gen/CORE.setting​:4778
  in method reify at src/gen/CORE.setting​:4549
  in method reify at src/gen/CORE.setting​:4549
  in method gimme at src/gen/CORE.setting​:4937
  in method reify at src/gen/CORE.setting​:4628
  in method reify at src/gen/CORE.setting​:4549
  in method reify at src/gen/CORE.setting​:4549
  in method gimme at src/gen/CORE.setting​:4937
  in method eager at src/gen/CORE.setting​:4912
  in method eager at src/gen/CORE.setting​:1024
  in sub eager at src/gen/CORE.setting​:5200
  in block <anon> at -e​:1

$

< moritz> I guess it doesn't really fail to open the file, but it fails
at error reporting
< moritz> if you look closely at the backtrace, you see that method
'get' calls method 'open'
< moritz> so it tries to re-open the file (?) and fails. It's not the
first open() that fails

From @moritz

fixed in 3d7cc4d306abd67502fdc941d503459e12ac574a, tested in
S16-filehandles/io.t

@moritz - Status changed from 'new' to 'resolved'