Constant rustc::session::config::db_type_desc::parse_opt_bool[][src]

pub const parse_opt_bool: Option<&'static str> = Some("one of: `y`, `yes`, `on`, `n`, `no`, or `off`")
🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?