diff --git a/frb_example/pure_dart/rust/Cargo.lock b/frb_example/pure_dart/rust/Cargo.lock
index f4c5e10b39..656f1b0ccb 100644
--- a/frb_example/pure_dart/rust/Cargo.lock
+++ b/frb_example/pure_dart/rust/Cargo.lock
@@ -131,6 +131,25 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "cbindgen"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b6d248e3ca02f3fbfabcb9284464c596baec223a26d91bbf44a5a62ddb0d900"
+dependencies = [
+ "clap 3.1.14",
+ "heck 0.4.0",
+ "indexmap",
+ "log",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn",
+ "tempfile",
+ "toml",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.70"
@@ -152,12 +171,36 @@ dependencies = [
  "ansi_term",
  "atty",
  "bitflags",
- "strsim",
- "textwrap",
+ "strsim 0.8.0",
+ "textwrap 0.11.0",
  "unicode-width",
  "vec_map",
 ]
 
+[[package]]
+name = "clap"
+version = "3.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "535434c063ced786eb04aaf529308092c5ab60889e8fe24275d15de07b01fa97"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_lex",
+ "indexmap",
+ "strsim 0.10.0",
+ "termcolor",
+ "textwrap 0.15.0",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a37c35f1112dad5e6e0b1adaff798507497a18fceeb30cceb3bae7d1427b9213"
+dependencies = [
+ "os_str_bytes",
+]
+
 [[package]]
 name = "convert_case"
 version = "0.5.0"
@@ -216,6 +259,7 @@ version = "1.28.1"
 dependencies = [
  "anyhow",
  "cargo_metadata",
+ "cbindgen",
  "convert_case",
  "enum_dispatch",
  "env_logger",
@@ -229,6 +273,7 @@ dependencies = [
  "structopt",
  "syn",
  "tempfile",
+ "thiserror",
  "toml",
 ]
 
@@ -272,6 +317,12 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "heck"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2540771e65fc8cb83cd6e8a237f70c319bd5c29f78ed1084ba5d50eeac86f7f9"
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.19"
@@ -389,6 +440,12 @@ version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
 
+[[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+
 [[package]]
 name = "parking_lot"
 version = "0.12.0"
@@ -577,13 +634,19 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
 [[package]]
 name = "structopt"
 version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c6b5c64445ba8094a6ab0c3cd2ad323e07171012d9c98b0b15651daf1787a10"
 dependencies = [
- "clap",
+ "clap 2.34.0",
  "lazy_static",
  "structopt-derive",
 ]
@@ -594,7 +657,7 @@ version = "0.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
 dependencies = [
- "heck",
+ "heck 0.3.3",
  "proc-macro-error",
  "proc-macro2",
  "quote",
@@ -644,6 +707,32 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
+
+[[package]]
+name = "thiserror"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd829fe32373d27f76265620b5309d0340cb8550f523c1dda251d6298069069a"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0396bc89e626244658bef819e22d0cc459e795a5ebe878e6ec336d1674a8d79a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "threadpool"
 version = "1.8.1"