diff --git a/helion/_compiler/generate_ast.py b/helion/_compiler/generate_ast.py
index 8ad8cb97..b48e420a 100644
--- a/helion/_compiler/generate_ast.py
+++ b/helion/_compiler/generate_ast.py
@@ -289,42 +289,47 @@ def visit_Call(self, node: ast.Call) -> ast.AST:
                     block_info.from_config(self.device_function.config)
                 )
             )
-        elif isinstance(type_info, SequenceType):
+        elif isinstance(type_info, SequenceType) and all(
+            isinstance(x, TileIndexType) for x in type_info.unpack()
+        ):
             values = type_info.unpack()
-            if all(isinstance(x, TileIndexType) for x in values):
-                block_infos = [env.block_sizes[x.block_id] for x in values]  # pyright: ignore[reportAttributeAccessIssue]
-                return expr_from_string(
-                    self.host_function.literal_expr(
-                        [
-                            x.from_config(self.device_function.config)
-                            for x in block_infos
-                        ]
-                    )
+            block_infos = [env.block_sizes[x.block_id] for x in values]  # pyright: ignore[reportAttributeAccessIssue]
+            return expr_from_string(
+                self.host_function.literal_expr(
+                    [x.from_config(self.device_function.config) for x in block_infos]
                 )
+            )
         elif (
             isinstance(fn_type_info := func_node._type_info, CallableType)
             and is_api_func(api := fn_type_info.value)
             and api._codegen is not None
         ):
+            ast_args = []
+            ast_kwargs = {}
             proxy_args = []
             proxy_kwargs = {}
             for arg in node.args:
                 assert not isinstance(arg, ast.Starred)
                 assert isinstance(arg, ExtendedAST)
                 assert arg._type_info is not None
+                ast_args.append(arg)
                 proxy_args.append(arg._type_info.proxy())
             for kwarg in node.keywords:
                 assert kwarg.arg is not None
                 assert isinstance(kwarg.value, ExtendedAST)
                 assert kwarg.value._type_info is not None
+                ast_kwargs[kwarg.arg] = kwarg.value
                 proxy_kwargs[kwarg.arg] = kwarg.value._type_info.proxy()
+            ast_params = api._signature.bind(*ast_args, **ast_kwargs)
             proxy_params = api._signature.bind(*proxy_args, **proxy_kwargs)
+            ast_params.apply_defaults()
             proxy_params.apply_defaults()
             return api._codegen(  # pyright: ignore[reportReturnType]
                 CodegenState(
                     self,
                     None,
                     proxy_args=[*proxy_params.arguments.values()],
+                    ast_args=[*ast_params.arguments.values()],
                 )
             )
         return self.generic_visit(node)