contracts 0.6.8

Design-by-contract attributes
Documentation 
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/* 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 obtain one at http://mozilla.org/MPL/2.0/. */

use proc_macro2::TokenStream;

use crate::implementation::{emit_error, ContractMode, ContractType, FuncWithContracts};

pub(crate) fn ensures(mode: ContractMode, attr: TokenStream, toks: TokenStream) -> TokenStream {
    let ty = ContractType::Ensures;

    let func = match syn::parse2(toks.clone()) {
        Ok(func) => func,
        Err(err) => return emit_error(err, toks),
    };

    let f = FuncWithContracts::new_with_initial_contract(func, ty, mode, attr);

    f.generate()
}