starlark 0.13.0

An implementation of the Starlark language in Rust.
Documentation 
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/*
 * Copyright 2019 The Starlark in Rust Authors.
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/// Deprecation handler provided by a user.
pub trait SoftErrorHandler {
    /// Handle deprecation error. If this function returns `Ok`, error will be ignored,
    /// otherwise error will be propagated.
    fn soft_error(&self, category: &str, error: crate::Error) -> Result<(), crate::Error>;
}

/// Default handler: warnings are treated as errors.
pub(crate) struct HardErrorSoftErrorHandler;

impl SoftErrorHandler for HardErrorSoftErrorHandler {
    fn soft_error(&self, _category: &str, error: crate::Error) -> Result<(), crate::Error> {
        Err(error)
    }
}