diff --git a/yunq/rust/Cargo.lock b/yunq/rust/Cargo.lock
index 7d49b6b..d5f212d 100644
--- a/yunq/rust/Cargo.lock
+++ b/yunq/rust/Cargo.lock
@@ -97,6 +97,28 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b6a852b24ab71dffc585bcb46eaf7959d175cb865a7152e35b348d1b2960422"
 
+[[package]]
+name = "genco"
+version = "0.17.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afac3cbb14db69ac9fef9cdb60d8a87e39a7a527f85a81a923436efa40ad42c6"
+dependencies = [
+ "genco-macros",
+ "relative-path",
+ "smallvec",
+]
+
+[[package]]
+name = "genco-macros"
+version = "0.17.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "553630feadf7b76442b0849fd25fdf89b860d933623aec9693fed19af0400c78"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -127,6 +149,18 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "relative-path"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba39f3699c378cd8970968dcbff9c43159ea4cfbd88d43c00b22f2ef10a435d2"
+
+[[package]]
+name = "smallvec"
+version = "1.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -234,4 +268,5 @@ name = "yunq"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "genco",
 ]
diff --git a/yunq/rust/Cargo.toml b/yunq/rust/Cargo.toml
index 2f9645f..8c0c88a 100644
--- a/yunq/rust/Cargo.toml
+++ b/yunq/rust/Cargo.toml
@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "4.5.7", features = ["derive"] }
+genco = { version = "0.17.9" }
diff --git a/yunq/rust/src/codegen.rs b/yunq/rust/src/codegen.rs
new file mode 100644
index 0000000..cf07f24
--- /dev/null
+++ b/yunq/rust/src/codegen.rs
@@ -0,0 +1,53 @@
+use crate::parser::{Decl, Field, Interface, Message};
+use genco::fmt;
+use genco::fmt::FmtWriter;
+use genco::prelude::quote_fn;
+use genco::prelude::quote_in;
+use genco::prelude::rust;
+use genco::prelude::FormatInto;
+use genco::prelude::Rust;
+
+pub fn generate_field_def<'a>(field: &'a Field) -> impl FormatInto<Rust> + 'a {
+    quote_fn!(
+        $(field.name.clone()): $(field.field_type.rust_type()),
+    )
+}
+
+pub fn generate_message_code<'a>(message: &'a Message) -> impl FormatInto<Rust> + 'a {
+    quote_fn!(
+    struct $(&message.name) {$['\r']
+    $(for field in &message.fields =>
+        $[' ']$(generate_field_def(field))$['\r']
+    )}$['\n']
+
+    impl $(&message.name) {$['\r']
+        jjj
+
+    }$['\n']
+    )
+}
+
+pub fn generate_code(ast: &Vec<Decl>) -> Result<String, std::fmt::Error> {
+    let mut tokens = rust::Tokens::new();
+
+    for decl in ast {
+        match decl {
+            Decl::Message(message) => quote_in!(tokens => $(generate_message_code(message))),
+            _ => {}
+        }
+    }
+
+    let mut w = FmtWriter::new(String::new());
+
+    let fmt = fmt::Config::from_lang::<Rust>()
+        .with_indentation(fmt::Indentation::Space(4))
+        .with_newline("\n");
+
+    let config = rust::Config::default()
+        // Prettier imports and use.
+        .with_default_import(rust::ImportMode::Qualified);
+
+    tokens.format_file(&mut w.as_formatter(&fmt), &config)?;
+
+    Ok(w.into_inner())
+}
diff --git a/yunq/rust/src/main.rs b/yunq/rust/src/main.rs
index b5ae3a0..c9fc119 100644
--- a/yunq/rust/src/main.rs
+++ b/yunq/rust/src/main.rs
@@ -1,3 +1,4 @@
+mod codegen;
 mod lexer;
 mod parser;
 
@@ -27,5 +28,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         println!("{:?}", decl);
     }
 
+    println!("{}", codegen::generate_code(ast_parser.ast())?);
+
     Ok(())
 }
diff --git a/yunq/rust/src/parser.rs b/yunq/rust/src/parser.rs
index 6dd3a18..85d7263 100644
--- a/yunq/rust/src/parser.rs
+++ b/yunq/rust/src/parser.rs
@@ -16,6 +16,19 @@ pub enum Type {
     Message(String),
 }
 
+impl Type {
+    pub fn rust_type(&self) -> &str {
+        match self {
+            Type::U64 => "u64",
+            Type::I64 => "i64",
+            Type::String => "String",
+            Type::Bytes => "Vec<u8>",
+            Type::Capability => "u64",
+            Type::Message(s) => s,
+        }
+    }
+}
+
 impl Display for Type {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(
@@ -50,23 +63,23 @@ impl TryFrom<&String> for Type {
 
 #[derive(Clone)]
 pub struct Field {
-    field_type: Type,
-    name: String,
-    number: u64,
-    repeated: bool,
+    pub field_type: Type,
+    pub name: String,
+    pub number: u64,
+    pub repeated: bool,
 }
 
 #[derive(Clone)]
 pub struct Message {
-    name: String,
-    fields: Vec<Field>,
+    pub name: String,
+    pub fields: Vec<Field>,
 }
 
 pub struct Method {
-    name: String,
-    number: u64,
-    request: Option<String>,
-    response: Option<String>,
+    pub name: String,
+    pub number: u64,
+    pub request: Option<String>,
+    pub response: Option<String>,
 }
 
 impl Debug for Method {
@@ -303,7 +316,7 @@ impl<'a> Parser<'a> {
         Ok(())
     }
 
-    pub fn ast(&'a mut self) -> &'a Vec<Decl> {
+    pub fn ast(&'a self) -> &'a Vec<Decl> {
         &self.ast
     }