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c08f46f836
<!-- if this PR closes one or more issues, you can automatically link the PR with them by using one of the [*linking keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword), e.g. - this PR should close #xxxx - fixes #xxxx you can also mention related issues, PRs or discussions! --> This fixes an issue brought up by nihilander in [Discord](https://discord.com/channels/601130461678272522/614593951969574961/1201594105986285649). # Description <!-- Thank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes. Description of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience. --> Nushell panics when the spread operator is used like this (the `...$rest` shouldn't actually be parsed as a spread operator at all): ```nu $ def foo [...rest: string] {...$rest} $ foo bar baz thread 'main' panicked at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/nu-protocol-0.89.0/src/signature.rs:650:9: Internal error: can't run a predeclaration without a body stack backtrace: 0: rust_begin_unwind 1: core::panicking::panic_fmt 2: <nu_protocol::signature::Predeclaration as nu_protocol::engine::command::Command>::run 3: nu_engine::eval::eval_call 4: nu_engine::eval::eval_expression_with_input 5: nu_engine::eval::eval_element_with_input 6: nu_engine::eval::eval_block 7: nu_cli::util::eval_source 8: nu_cli::repl::evaluate_repl 9: nu::run::run_repl 10: nu::main note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. ``` The problem was that whenever the parser saw something like `{...$`, `{...(`, or `{...[`, it would treat that as a record with a spread expression, ignoring the syntax shape of the block it was parsing. This should now be fixed, and the snippet above instead gives the following error: ```nu Error: nu:🐚:external_command × External command failed ╭─[entry #1:1:1] 1 │ def foo [...rest] {...$rest} · ────┬─── · ╰── executable was not found ╰──── help: No such file or directory (os error 2) ``` # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> Stuff like `do { ...$rest }` will now try to run a command `...$rest` rather than complaining that variable `$rest` doesn't exist. # Tests + Formatting <!-- Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass (on Windows make sure to [enable developer mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging)) - `cargo run -- -c "use std testing; testing run-tests --path crates/nu-std"` to run the tests for the standard library > **Note** > from `nushell` you can also use the `toolkit` as follows > ```bash > use toolkit.nu # or use an `env_change` hook to activate it automatically > toolkit check pr > ``` --> # After Submitting <!-- If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. --> Sorry about the issue, I am not touching the parser again for a long time :)
Nushell REPL
This directory contains the main Nushell REPL (read eval print loop) as part of the CLI portion of Nushell, which creates the nu binary itself.
Current versions of the nu binary will use the Nu argument parsing logic to parse the commandline arguments passed to nu, leaving the logic here to be a thin layer around what the core libraries.