Refine no-std sample.

no_std/no_std_test/src/main.rs

@@ -0,0 +1,41 @@
+//! This is a `no-std` application for the that evaluates
+//! a simple expression and uses the result as the return value.
+
+#![no_std]
+#![feature(alloc_error_handler, start, core_intrinsics, lang_items)]
+
+extern crate alloc;
+extern crate wee_alloc;
+
+#[global_allocator]
+static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+use rhai::{Engine, INT};
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    let engine = Engine::new();
+
+    // Evaluate a simple expression: 40 + 2
+    engine.eval::<INT>("40 + 2").unwrap() as isize
+}
+
+#[alloc_error_handler]
+fn foo(_: core::alloc::Layout) -> ! {
+    core::intrinsics::abort();
+}
+
+#[panic_handler]
+#[lang = "panic_impl"]
+extern "C" fn rust_begin_panic(_: &core::panic::PanicInfo) -> ! {
+    core::intrinsics::abort();
+}
+
+#[lang = "eh_personality"]
+extern "C" fn eh_personality() {}
+
+#[no_mangle]
+extern "C" fn rust_eh_register_frames() {}
+
+#[no_mangle]
+extern "C" fn rust_eh_unregister_frames() {}