Add enum aliases to Rust

Author: axic

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

@@ -5,3 +5,18 @@ pub use evmc_sys as ffi;
 // TODO: Add convenient helpers for evmc_result
 // TODO: Add convenient helpers for evmc_execute
 // TODO: Add a derive macro here for creating evmc_create
+
+/// EVMC message (call) kind.
+pub type MessageKind = ffi::evmc_call_kind;
+
+/// EVMC message (call) flags.
+pub type MessageFlags = ffi::evmc_flags;
+
+/// EVMC status code.
+pub type StatusCode = ffi::evmc_status_code;
+
+/// EVMC storage status.
+pub type StorageStatus = ffi::evmc_storage_status;
+
+/// EVMC VM revision.
+pub type Revision = ffi::evmc_revision;