feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-rust-wasm/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "wit-bindgen-gen-rust-wasm"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+
+[lib]
+test = false
+doctest = false
+
+[dependencies]
+wit-bindgen-gen-core = { path = '../gen-core', version = '0.1.0' }
+wit-bindgen-gen-rust = { path = '../gen-rust', version = '0.1.0' }
+heck = "0.3"
+structopt = { version = "0.3", default-features = false, optional = true }
+
+[dev-dependencies]
+wit-bindgen-rust = { path = '../rust-wasm' }
+test-helpers = { path = '../test-helpers', features = ['wit-bindgen-gen-rust-wasm'] }

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-rust-wasm/build.rs

@@ -0,0 +1,4 @@
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    // this build script is currently only here so OUT_DIR is set for testing.
+}

__wasm/wit-bindgen-sample/wit-bindgen/crates/gen-rust-wasm/tests/codegen.rs

@@ -0,0 +1,32 @@
+#![allow(dead_code, type_alias_bounds)]
+
+#[test]
+fn ok() {}
+
+#[rustfmt::skip]
+mod imports {
+    test_helpers::codegen_rust_wasm_import!(
+        "*.wit"
+
+        // If you want to exclude a specific test you can include it here with
+        // gitignore glob syntax:
+        //
+        // "!wasm.wit"
+        // "!host.wit"
+        //
+        //
+        // Similarly you can also just remove the `*.wit` glob and list tests
+        // individually if you're debugging.
+    );
+}
+
+mod exports {
+    test_helpers::codegen_rust_wasm_export!(
+        "*.wit"
+
+        // TODO: these use push/pull buffer which isn't implemented in the test
+        // generator just yet
+        "!wasi-next.wit"
+        "!host.wit"
+    );
+}