Return None when string literal from source exceeds max width
Return None when string literal from source exceeds max width

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