fix: compile error when using enum in flutter

libs/flutter_rust_bridge_codegen/src/ir/ty_struct.rs

@@ -0,0 +1,66 @@
+use crate::ir::*;
+use convert_case::{Case, Casing};
+
+#[derive(Debug, Clone)]
+pub struct IrTypeStructRef {
+    pub name: String,
+    pub freezed: bool,
+}
+
+impl IrTypeStructRef {
+    pub fn get<'a>(&self, f: &'a IrFile) -> &'a IrStruct {
+        &f.struct_pool[&self.name]
+    }
+}
+
+impl IrTypeTrait for IrTypeStructRef {
+    fn visit_children_types<F: FnMut(&IrType) -> bool>(&self, f: &mut F, ir_file: &IrFile) {
+        for field in &self.get(ir_file).fields {
+            field.ty.visit_types(f, ir_file);
+        }
+    }
+
+    fn safe_ident(&self) -> String {
+        self.dart_api_type().to_case(Case::Snake)
+    }
+    fn dart_api_type(&self) -> String {
+        self.name.to_string()
+    }
+
+    fn dart_wire_type(&self) -> String {
+        self.rust_wire_type()
+    }
+
+    fn rust_api_type(&self) -> String {
+        self.name.to_string()
+    }
+
+    fn rust_wire_type(&self) -> String {
+        format!("wire_{}", self.name)
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct IrStruct {
+    pub name: String,
+    pub wrapper_name: Option<String>,
+    pub path: Option<Vec<String>>,
+    pub fields: Vec<IrField>,
+    pub is_fields_named: bool,
+    pub dart_metadata: Vec<IrDartAnnotation>,
+    pub comments: Vec<IrComment>,
+}
+
+impl IrStruct {
+    pub fn brackets_pair(&self) -> (char, char) {
+        if self.is_fields_named {
+            ('{', '}')
+        } else {
+            ('(', ')')
+        }
+    }
+
+    pub fn using_freezed(&self) -> bool {
+        self.dart_metadata.iter().any(|it| it.content == "freezed")
+    }
+}