You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: procedure.rs
    path of file: ./repos/prusti-dev/prusti-interface/src/environment
    
    the code of the file until where you have to start completion: // Â© 2019, ETH Zurich
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtai
    
pub fn is_marked_specification_block(env_query: EnvQuery, bb_data: &BasicBlockData) -> bool {
    for stmt in &bb_data.statements {
        if let StatementKind::Assign(box (
            _,
            Rvalue::Aggregate(box AggregateKind::Closure(def_id, _), _),
        )) = &stmt.kind
        {
            if is_spec_closure(env_query, *def_id) {
                return true;
            }
        }
    }
    false
}