Constant syntax::feature_gate::EXPLAIN_MACRO_AT_MOST_ONCE_REP
[−]
[src]
pub const EXPLAIN_MACRO_AT_MOST_ONCE_REP: &'static str=
"Using the `?` macro Kleene operator for \"at most one\" repetition is unstable"
🔬 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?