Vendor things

third-party/vendor/rustc-demangle/README.md

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+# rustc-demangle
+
+Demangling for Rust symbols, written in Rust.
+
+[Documentation](https://docs.rs/rustc-demangle)
+
+## Usage
+
+You can add this as a dependency via your `Cargo.toml`
+
+```toml
+[dependencies]
+rustc-demangle = "0.1"
+```
+
+and then be sure to check out the [crate
+documentation](https://docs.rs/rustc-demangle) for usage.
+
+## Usage from non-Rust languages
+
+You can also use this crate from other languages via the C API wrapper in the
+`crates/capi` directory. This can be build with:
+
+```sh
+$ cargo build -p rustc-demangle-capi --release
+```
+
+You'll then find `target/release/librustc_demangle.a` and
+`target/release/librustc_demangle.so` (or a different name depending on your
+platform). These objects implement the interface specified in
+`crates/capi/include/rustc_demangle.h`.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in rustc-demangle you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.