RDMD can't eval code because of missing cstream module

[Meta via Digitalmars-d-learn]

On Monday, 21 November 2016 at 16:44:34 UTC, Kagamin wrote:
> https://github.com/dlang/tools/commit/5ed4f176f41b7559c64cf525c07ccf13ca3a5160 this?

That seems like a probable cause, but where is cstream being 
referenced? I did github search for cstream and all it came up 
with were references from Undead (legacy Phobos library) and in 
makefiles. I'm not a make expert, but I don't think these are the 
cause.

https://github.com/search?q=org%3Adlang+cstream&type=Code