Function syntax_ext::cfg::expand_cfg[][src]

pub fn expand_cfg<'cx>(
    cx: &mut ExtCtxt,
    sp: Span,
    tts: &[TokenTree]
) -> Box<MacResult + 'static>
🔬 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?