Mark the repository as no longer maintained

Closes #283

README.md

@@ -1,89 +1 @@
-# Starlark in Rust
-_An implementation in Rust of the Starlark language_
-
-[![Build
-Status](https://travis-ci.org/google/starlark-rust.svg?branch=master)](https://travis-ci.org/google/starlark-rust)
-
-**Disclaimer:** This is not an officially supported Google product. This project is supported
-on a best-effort basis and [welcome contributions](CONTRIBUTING.md).
-
-[Starlark](https://github.com/bazelbuild/starlark), formerly codenamed Skylark, is a non-Turing
-complete language based on Python that was made for the [Bazel build system](https://bazel.build) to
-define compilation plugin.
-
-Starlark has at least 3 implementations: a [Java one for Bazel](
-https://github.com/bazelbuild/bazel/tree/master/src/main/java/com/google/devtools/skylark),
-a [Go one](https://github.com/google/skylark) and this one.
-
-This interpreter was made using the [specification from the go version](
-https://github.com/google/skylark/blob/a0e5de7e63b47e716cca7226662a4c95d47bf873/doc/spec.md)
-and the Python 3 documentation when things were unclear.
-
-This interpreter does not support most of the go extensions (e.g. bitwise
-operator or floating point). It optionally includes a `set` type
-(by explicitly including `starlark::linked_hash_set::global()` environment),
-as an extension which is not specified in [the
-official Starlark specification](https://github.com/bazelbuild/starlark/blob/master/spec.md), but note that this
-is just an insertion-order-preserving set, and does not have optimisations for nesting as can be found in the
-starlark Java implementation's [depset](https://docs.bazel.build/versions/master/skylark/lib/depset.html) implementation.
-It uses signed 64-bit integers.
-
-## Usage
-
-### Crate
-
-You can depend on the `starlark` crate, it is documented using [docs.rs](https://docs.rs/crate/starlark).
-Examples are listed under [starlark/examples](starlark/examples). You can run the examples
-using `cargo run --example`, such as
-
-```sh
-echo "str([x * 2 for x in range(10)])" | cargo run --example starlark-simple-cli
-```
-
-### Command line REPL
-
-A command line interpreter is also provided by this project under [starlark-repl](starlark-repl),
-it can interpret files passed at the command line and also start a REPL (Read-Eval-Print Loop).
-The usage of this program is:
-
-```
-Starlark in Rust interpreter
-
-USAGE:
-    starlark-rust [FLAGS] [OPTIONS] [file]...
-
-FLAGS:
-    -a, --ast           Parse and print AST instead of evaluating.
-    -b, --build-file    Parse the build file format instead of full Starlark. See https://docs.rs/starlark/0.3.0-
-                        pre/starlark/eval/index.html#build_file
-    -h, --help          Prints help information
-    -r, --repl          Run a REPL after files have been parsed.
-    -V, --version       Prints version information
-
-OPTIONS:
-    -c <command>        Starlark command to run after files have been parsed.
-
-ARGS:
-    <file>...    Files to interpret
-```
-
-## Development
-
-### Build
-
-This project build with [Cargo](https://doc.rust-lang.org/stable/cargo/). Simply
-run `cargo test` to test it, `cargo build --release` to build a release version
-and `cargo run` to run the command-line interpreter.
-
-### Possible improvements and optimizations
-
-* Errors:
-  - When an identifier is not found, we can suggest close identifier / keyword.
-  - Fix suggestions maybe?
-  - Better error spans.
-  - Recoverable errors (don't stop at the first error, continue parsing).
-* Evaluation:
-  - Static rewrite of the AST before evaluation (e.g. for constant values)
-* Awesome feature:
-  - Implement a debugging protocol server side (compatible with the Java one,
-    see (bazelbuild/vscode-bazel#6)).
+# This repository has been replaced by https://github.com/facebookexperimental/starlark-rust and is no longer maintained.