Remove an old in-progress comment from a previous PR.
Remove an old in-progress comment from a previous PR.

This comment wasn't supposed to have landed.

graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust