fix msvc

examples/smoke.rs

@@ -0,0 +1,17 @@
+extern crate mruby_compiler2_sys;
+use mruby_compiler2_sys::MRubyCompiler2Context;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    unsafe {
+        let mut cxt = MRubyCompiler2Context::new();
+        cxt.dump_bytecode("puts \"Hello, mruby-compiler2!\"")?;
+
+        let bin = cxt.compile("puts \"Hello, mruby-compiler2!\"")?;
+
+        let out = std::fs::File::create("examples/out.mrb")?;
+        std::io::Write::write_all(&mut &out, &bin)?;
+
+        println!("Compiled bytecode file: examples/out.mrb, size: {}", bin.len());
+    }
+    Ok(())
+}