Fix SearchVisitor not properly visiting all nodes

trans/transpiler/phases/emit_cpp/search.py

@@ -4,17 +4,15 @@ import ast
 from transpiler.phases.emit_cpp import NodeVisitor
 
 
-class SearchVisitor(NodeVisitor):
-    def missing_impl(self, node):
-        if not hasattr(node, "__dict__"):
-            return
-        for val in node.__dict__.values():
-            if isinstance(val, list):
-                for item in val:
-                    if isinstance(val, ast.AST):
+class SearchVisitor(ast.NodeVisitor):
+    def generic_visit(self, node):
+        for field, value in ast.iter_fields(node):
+            if isinstance(value, list):
+                for item in value:
+                    if isinstance(item, ast.AST):
                         yield from self.visit(item)
-            elif isinstance(val, ast.AST):
-                yield from self.visit(val)
+            elif isinstance(value, ast.AST):
+                yield from self.visit(value)
 
     def match(self, node) -> bool:
         return next(self.visit(node), False)