Function syntax::source_map::original_sp

pub fn original_sp(sp: Span, enclosing_sp: Span) -> Span

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Returns the span itself if it doesn't come from a macro expansion, otherwise return the call site span up to the enclosing_sp by following the expn_data chain.