Function syntax::util::comments::all_whitespace

fn all_whitespace(s: &str, col: CharPos) -> Option<usize>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Returns None if the first col chars of s contain a non-whitespace char. Otherwise returns Some(k) where k is first char offset after that leading whitespace. Note that k may be outside bounds of s.