Rust: silence warning by removing unused generated function

Author: Paolo Tranquilli

rust/ast-generator/src/main.rs

@@ -465,8 +465,12 @@ struct ExtractorInfo {
     nodes: Vec<ExtractorNodeInfo>,
 }
 
-fn enum_to_extractor_info(node: &AstEnumSrc) -> ExtractorEnumInfo {
-    ExtractorEnumInfo {
+fn enum_to_extractor_info(node: &AstEnumSrc) -> Option<ExtractorEnumInfo> {
+    if node.name == "VariantDef" {
+        // currently defined but unused
+        return None;
+    }
+    Some(ExtractorEnumInfo {
         name: class_name(&node.name),
         snake_case_name: to_lower_snake_case(&node.name),
         ast_name: node.name.clone(),
@@ -478,7 +482,7 @@ fn enum_to_extractor_info(node: &AstEnumSrc) -> ExtractorEnumInfo {
                 snake_case_name: to_lower_snake_case(v),
             })
             .collect(),
-    }
+    })
 }
 
 fn field_info_to_extractor_info(node: &AstNodeSrc, field: &FieldInfo) -> ExtractorNodeFieldInfo {
@@ -528,7 +532,7 @@ fn node_to_extractor_info(node: &AstNodeSrc) -> ExtractorNodeInfo {
 
 fn write_extractor(grammar: &AstSrc) -> mustache::Result<String> {
     let extractor_info = ExtractorInfo {
-        enums: grammar.enums.iter().map(enum_to_extractor_info).collect(),
+        enums: grammar.enums.iter().filter_map(enum_to_extractor_info).collect(),
         nodes: grammar.nodes.iter().map(node_to_extractor_info).collect(),
     };
     let template = mustache::compile_str(include_str!("templates/extractor.mustache"))?;