Function rustc_demangle::try_demangle

pub fn try_demangle(s: &str) -> Result<Demangle, TryDemangleError>

The same as demangle, except return an Err if the string does not appear to be a Rust symbol, rather than "demangling" the given string as a no-op.

extern crate rustc_demangle;

let not_a_rust_symbol = "la la la";

// The `try_demangle` function will reject strings which are not Rust symbols.
assert!(rustc_demangle::try_demangle(not_a_rust_symbol).is_err());

// While `demangle` will just pass the non-symbol through as a no-op.
assert_eq!(rustc_demangle::demangle(not_a_rust_symbol).as_str(), not_a_rust_symbol);