Function syntax::ext::tt::macro_rules::compile

pub fn compile(
    sess: &ParseSess, 
    features: &RefCell<Features>, 
    def: &Item
) -> SyntaxExtension

🔬 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?

Converts a macro_rules! invocation into a syntax extension.