[][src]Function rustc_lexer::is_id_start

pub fn is_id_start(c: char) -> bool
⚙️ 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.

True if c is valid as a first character of an identifier. See Rust language reference for a formal definition of valid identifier name.