starlark 0.8.0

An implementation of the Starlark language in Rust.
Documentation 
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/*
 * Copyright 2018 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.
 */

/// Initialize `$loc` to `FrozenRef<FrozenFileSpan>` with rust file and line number.
macro_rules! rust_loc {
    () => {{
        use crate::{
            codemap::{CodeMap, NativeCodeMap},
            eval::runtime::call_stack::FrozenFileSpan,
            values::FrozenRef,
        };

        static NATIVE_CODEMAP: NativeCodeMap = NativeCodeMap::new(file!(), line!(), column!());
        static CODEMAP: CodeMap = NATIVE_CODEMAP.to_codemap();
        static FROZEN_FILE_SPAN: FrozenFileSpan =
            FrozenFileSpan::new_unchecked(FrozenRef::new(&CODEMAP), NativeCodeMap::FULL_SPAN);
        static LOC: FrozenRef<'static, FrozenFileSpan> = FrozenRef::new(&FROZEN_FILE_SPAN);
        LOC
    }};
}

pub(crate) use rust_loc;

#[cfg(test)]
mod tests {
    use crate as starlark;
    use crate::{assert::Assert, environment::GlobalsBuilder, eval::Arguments, values::Value};

    #[starlark_module]
    fn rust_loc_globals(globals: &mut GlobalsBuilder) {
        fn invoke<'v>(f: Value<'v>) -> anyhow::Result<Value<'v>> {
            f.invoke_with_loc(Some(rust_loc!()), &Arguments::default(), eval)
        }
    }

    #[test]
    fn test_rust_loc() {
        let mut a = Assert::new();
        a.globals_add(rust_loc_globals);
        let err = a.fail("invoke(fail)", "");
        let err = err.to_string();
        // Stack trace should contain invocation in `invoke`.
        assert!(
            // Make test compatible with Windows.
            err.replace('\\', "/")
                .contains("starlark/src/eval/runtime/rust_loc.rs"),
            "output: {:?}",
            err
        );
        assert!(err.contains("<native>"), "output: {:?}", err);
    }
}