Introduce the new Rust port

source/ports/rs_port2/.gitignore

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+/target

source/ports/rs_port2/Cargo.toml

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+workspace = { members = ["crates/metacall-bindings"] }
+[package]
+name = "metacall-rs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.93"
+metacall-bindings = { path = "crates/metacall-bindings" }
+thiserror = "2.0.3"

source/ports/rs_port2/README.md

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+> Under development. Don't use it in production!
+
+# Metacall Rust Port
+Improved version for [Metacall Rust Port](https://github.com/metacall/core/tree/develop/source/ports/rs_port).

source/ports/rs_port2/crates/metacall-bindings/.gitignore

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+/target
+!build.rs

source/ports/rs_port2/crates/metacall-bindings/Cargo.toml

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+[package]
+name = "metacall-bindings"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

source/ports/rs_port2/crates/metacall-bindings/build.rs

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+use std::env;
+
+fn main() {
+    // When running tests from CMake
+    if let Ok(val) = env::var("PROJECT_OUTPUT_DIR") {
+        // Link search path to build folder
+        println!("cargo:rustc-link-search=native={val}");
+
+        // Link against correct version of metacall
+        match env::var("CMAKE_BUILD_TYPE") {
+            Ok(val) => {
+                if val == "Debug" {
+                    // Try to link the debug version when running tests
+                    println!("cargo:rustc-link-lib=dylib=metacalld");
+                } else {
+                    println!("cargo:rustc-link-lib=dylib=metacall");
+                }
+            }
+            Err(_) => {
+                println!("cargo:rustc-link-lib=dylib=metacall");
+            }
+        }
+    } else {
+        // When building from Cargo
+        println!("cargo:rustc-link-lib=dylib=metacall")
+    }
+}
+
+