Macro rustc::implement_ty_decoder

macro_rules! implement_ty_decoder {
    ($DecoderName:ident <$($typaram:tt),*>) => { ... };
}

🔬 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?