Chris Seaton

Note that macOS 11 isn't part of the issue any more Graal works fine on that.

Graph: [graph.bgv.gz](https://github.com/oracle/graal/files/9292705/graph.bgv.gz)

I thought new nodes never went into the graph if they were duplicates of existing nodes? Is that not the case? Or is that only during graph building and PE?...

Didn't we used to have the option for managed IO?

Can you run with `--exceptions-print-java`.

Does that make the underlying problem clear? We can't load RubyGems without being able to do native IO, to implement a method like `directory?`. Should that method just be implemented...

Yes we should impelment this. Just for history and exposition: all our IO goes through native POSIX calls because we already had a Ruby core-library implementation written in Ruby that...

We've got a `bin` directory - what else do we have or not have that causes the problem?

Right I get the problem then.

Maybe if we try a super-optimizer there's some sequence of instructions that does this more simply?