Add rust 1.57.0

runtimes/default.nix

@@ -52,4 +52,5 @@ args: {
     "yabasic" = import ./yabasic.nix args;
     "emacs" = import ./emacs.nix args;
     "gnat-ada" = import ./gnat-ada.nix args;
+    "rust" = import ./rust.nix args;
 }

runtimes/rust.nix

@@ -0,0 +1,47 @@
+{pkgs, piston, ...}:
+let
+    gccPackage = pkgs.gcc;  # gcc is required for the linker
+    pkg = pkgs.rustc;
+in piston.mkRuntime {
+    language = "rust";
+    version = pkg.version;
+
+    aliases = [
+        "rs"
+    ];
+
+    compile = ''
+        ${pkg}/bin/rustc -o binary -C linker=${gccPackage}/bin/gcc $1
+        chmod +x binary
+    '';
+
+    run = ''
+        shift
+        ./binary "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.rs" = ''
+                    pub mod helper;
+                    use std::env;
+
+                    fn main() {
+                        let args: Vec<String> = env::args().collect();
+                        helper::print_something(args[1].to_string());
+                    }
+                '';
+                "helper.rs" = ''
+                    pub fn print_something(what: String) -> () {
+                        println!("{}", what);
+                    }
+                '';
+            };
+            args = ["OK"];
+            stdin = "";
+            packages = [];
+            main = "test.rs";
+        })
+    ];
+}