implement drop instead of manual destroy

Author: axic

bindings/rust/evmc-client/src/lib.rs

@@ -17,6 +17,13 @@ pub struct EvmcVm {
     host_interface: *mut ffi::evmc_host_interface,
 }
 
+impl Drop for EvmcVm {
+    fn drop(&mut self) {
+        debug_assert!(!self.handle.is_null());
+        unsafe { ((*self.handle).destroy.unwrap())(self.handle) }
+    }
+}
+
 impl EvmcVm {
     pub fn get_abi_version(&self) -> i32 {
         unsafe {
@@ -39,10 +46,6 @@ impl EvmcVm {
         }
     }
 
-    pub fn destroy(&self) {
-        unsafe { ((*self.handle).destroy.unwrap())(self.handle) }
-    }
-
     pub fn execute(
         &self,
         ctx: &mut dyn host::HostContext,