Vendor things

third-party/vendor/new_debug_unreachable/README.md

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+# new_debug_unreachable
+
+> unreachable!() in debug, std::intrinsics::unreachable() in release.
+
+This is a fork of [`debug_unreachable`](https://crates.io/crates/debug_unreachable).
+
+## [Documentation](https://docs.rs/new_debug_unreachable)
+
+## Usage
+
+Use the crates.io repository; add this to your `Cargo.toml` along
+with the rest of your dependencies:
+
+```toml
+[dependencies]
+new_debug_unreachable = "1.0"
+```
+
+In your Rust code, the library name is still `debug_unreachable`:
+
+```rust
+use debug_unreachable::debug_unreachable;
+
+fn main() {
+    if 0 > 100 {
+        // Can't happen!
+        unsafe { debug_unreachable!() }
+    } else {
+        println!("Good, 0 <= 100.");
+    }
+}
+```
+
+## Author
+
+[Jonathan Reem](https://medium.com/@jreem) is the original author of debug-unreachable.
+
+[Matt Brubeck](https://limpet.net/mbrubeck/) is the maintainer of this fork.
+
+## License
+
+MIT