Format code block with sharp prefix
Format code block with sharp prefix

by hiding lines with a leading `#` behind a custom comment.

aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,SingingTree/rustfmt,graydon/rust,SingingTree/rustfmt,aidancully/rust,rust-lang/rustfmt,rust-lang/rustfmt,graydon/rust