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-{{#title Result<T> — Rust ♡ C++}}
-# Result\<T\>
-
-Result\<T\> is allowed as the return type of an extern function in either
-direction. Its behavior is to translate to/from C++ exceptions. If your codebase
-does not use C++ exceptions, or prefers to represent fallibility using something
-like outcome\<T\>, leaf::result\<T\>, StatusOr\<T\>, etc then you'll need to
-handle the translation of those to Rust Result\<T\> using your own shims for
-now. Better support for this is planned.
-
-If an exception is thrown from an `extern "C++"` function that is *not* declared
-by the CXX bridge to return Result, the program calls C++'s `std::terminate`.
-The behavior is equivalent to the same exception being thrown through a
-`noexcept` C++ function.
-
-If a panic occurs in *any* `extern "Rust"` function, regardless of whether it is
-declared by the CXX bridge to return Result, a message is logged and the program
-calls Rust's `std::process::abort`.
-
-## Returning Result from Rust to C++
-
-An `extern "Rust"` function returning a Result turns into a `throw` in C++ if
-the Rust side produces an error.
-
-Note that the return type written inside of cxx::bridge must be written without
-a second type parameter. Only the Ok type is specified for the purpose of the
-FFI. The Rust *implementation* (outside of the bridge module) may pick any error
-type as long as it has a std::fmt::Display impl.
-
-```rust,noplayground
-# use std::io;
-#
-#[cxx::bridge]
-mod ffi {
-    extern "Rust" {
-        fn fallible1(depth: usize) -> Result<String>;
-        fn fallible2() -> Result<()>;
-    }
-}
-
-fn fallible1(depth: usize) -> anyhow::Result<String> {
-    if depth == 0 {
-        return Err(anyhow::Error::msg("fallible1 requires depth > 0"));
-    }
-    ...
-}
-
-fn fallible2() -> Result<(), io::Error> {
-    ...
-    Ok(())
-}
-```
-
-The exception that gets thrown by CXX on the C++ side is always of type
-`rust::Error` and has the following C++ public API. The `what()` member function
-gives the error message according to the Rust error's std::fmt::Display impl.
-
-```cpp,hidelines
-// rust/cxx.h
-#
-# namespace rust {
-
-class Error final : public std::exception {
-public:
-  Error(const Error &);
-  Error(Error &&) noexcept;
-  ~Error() noexcept;
-
-  Error &operator=(const Error &);
-  Error &operator=(Error &&) noexcept;
-
-  const char *what() const noexcept override;
-};
-#
-# } // namespace rust
-```
-
-## Returning Result from C++ to Rust
-
-An `extern "C++"` function returning a Result turns into a `catch` in C++ that
-converts the exception into an Err for Rust.
-
-Note that the return type written inside of cxx::bridge must be written without
-a second type parameter. Only the Ok type is specified for the purpose of the
-FFI. The resulting error type created by CXX when an `extern "C++"` function
-throws will always be of type **[`cxx::Exception`]**.
-
-[`cxx::Exception`]: https://docs.rs/cxx/*/cxx/struct.Exception.html
-
-```rust,noplayground
-# use std::process;
-#
-#[cxx::bridge]
-mod ffi {
-    unsafe extern "C++" {
-        include!("example/include/example.h");
-        fn fallible1(depth: usize) -> Result<String>;
-        fn fallible2() -> Result<()>;
-    }
-}
-
-fn main() {
-    if let Err(err) = ffi::fallible1(99) {
-        eprintln!("Error: {}", err);
-        process::exit(1);
-    }
-}
-```
-
-The specific set of caught exceptions and the conversion to error message are
-both customizable. The way you do this is by defining a template function
-`rust::behavior::trycatch` with a suitable signature inside any one of the
-headers `include!`'d by your cxx::bridge.
-
-The template signature is required to be:
-
-```cpp,hidelines
-namespace rust {
-namespace behavior {
-
-template <typename Try, typename Fail>
-static void trycatch(Try &&func, Fail &&fail) noexcept;
-
-} // namespace behavior
-} // namespace rust
-```
-
-The default `trycatch` used by CXX if you have not provided your own is the
-following. You must follow the same pattern: invoke `func` with no arguments,
-catch whatever exception(s) you want, and invoke `fail` with the error message
-you'd like for the Rust error to have.
-
-```cpp,hidelines
-# #include <exception>
-#
-# namespace rust {
-# namespace behavior {
-#
-template <typename Try, typename Fail>
-static void trycatch(Try &&func, Fail &&fail) noexcept try {
-  func();
-} catch (const std::exception &e) {
-  fail(e.what());
-}
-#
-# } // namespace behavior
-# } // namespace rust
-```