{"task": {"agent_timeout": 14400, "task": "nushell__nushell10395", "verifier_timeout": 7200, "instruction": "<uploaded_files>\n/workspace/nushell\n</uploaded_files>\n\nI've uploaded a Rust code repository in the directory /workspace/nushell. Consider the following issue description:\n\n<issue_description>\n# Fix panic on too few arguments for custom function\n\n<!--\nif this PR closes one or more issues, you can automatically link the PR with\nthem 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.\n- this PR should close #xxxx\n- fixes #xxxx\n\nyou can also mention related issues, PRs or discussions!\n-->\n\n# Description\n<!--\nThank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes.\n\nDescription of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience.\n-->\n\nOld code was comparing remaining positional arguments with total number\nof arguments, where it should've compared remaining positional with\nwith remaining arguments of any kind. This means that if a function was given too few arguments, `calculate_end_span` would believe that it actually had too many arguments, since after parsing the first few arguments, the number of remaining arguments needed were fewer than the *total* number of arguments, of which we had used several.\n\nFixes #9072\nFixes: https://github.com/nushell/nushell/issues/13930\nFixes: https://github.com/nushell/nushell/issues/12069\nFixes: https://github.com/nushell/nushell/issues/8385\n\nExtracted from #10381\n\n## Bonus\n\nIt also improves the error handling on missing positional arguments before keywords (no longer crashing since #9851). Instead of just giving the keyword to the parser for the missing positional, we give an explicit error about a missing positional argument. I would like better descriptions than \"missing var_name\" though, but I'm not sure if that's available without \n\nOld error\n```\nError: nu::parser::parse_mismatch\n\n  \u00d7 Parse mismatch during operation.\n   \u256d\u2500[entry #1:1:1]\n 1 \u2502 let = if foo\n   \u00b7     \u252c\n   \u00b7     \u2570\u2500\u2500 expected valid variable name\n   \u2570\u2500\u2500\u2500\u2500\n```\n\nNew error\n```\nError: nu::parser::missing_positional\n\n  \u00d7 Missing required positional argument.\n   \u256d\u2500[entry #18:1:1]\n 1 \u2502 let = foo\n   \u00b7    \u252c\n   \u00b7    \u2570\u2500\u2500 missing var_name\n   \u2570\u2500\u2500\u2500\u2500\n  help: Usage: let <var_name> = <initial_value>\n```\n\n# User-Facing Changes\n<!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. -->\n\nThe program `alias = = =` is no longer accepted by the parser\n\n# Tests + Formatting\n\n- [x] Don't forget to add tests that cover your changes.\n\nMake sure you've run and fixed any issues with these commands:\n\n- [x] `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes)\n- [x] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to check that you're using the standard code style\n- [x] `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))\n- [x] `cargo run -- -c \"use std testing; testing run-tests --path crates/nu-std\"` to run the tests for the standard library\n\n> **Note**\n> from `nushell` you can also use the `toolkit` as follows\n> ```bash\n> use toolkit.nu  # or use an `env_change` hook to activate it automatically\n> toolkit check pr\n> ```\n-->\n\n# After Submitting\n<!-- 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. -->\n\n\n## Repository Information\n- **Repository**: nushell/nushell\n- **Pull Request**: #10395\n- **Base Commit**: `d68c3ec89a8efa304246467f80140c59467ba94f`\n\n## Related Issues\n- https://github.com/nushell/nushell/issues/9072\n</issue_description>\n\nCan you help me implement the necessary changes to the repository so that the requirements specified in the <issue_description> are met?\nI've already taken care of all changes to any of the test files described in the <issue_description>. This means you DON'T have to modify the testing logic or any of the tests in any way!\nAlso the development Rust environment is already set up for you (i.e., all dependencies already installed), so you don't need to install other packages.\nYour task is to make the minimal changes to non-test files in the /workspace/nushell directory to ensure the <issue_description> is satisfied.\n\nFollow these phases to resolve the issue:\n\nPhase 1. READING: read the problem and reword it in clearer terms\n   1.1 If there are code or config snippets. Express in words any best practices or conventions in them.\n   1.2 Highlight message errors, method names, variables, file names, stack traces, and technical details.\n   1.3 Explain the problem in clear terms.\n   1.4 Enumerate the steps to reproduce the problem.\n   1.5 Highlight any best practices to take into account when testing and fixing the issue.\n\nPhase 2. RUNNING: install and run the tests on the repository\n   2.1 Follow the readme.\n   2.2 Install the environment and anything needed.\n   2.3 Iterate and figure out how to run the tests.\n\nPhase 3. EXPLORATION: find the files that are related to the problem and possible solutions\n   3.1 Use `grep` to search for relevant methods, classes, keywords and error messages.\n   3.2 Identify all files related to the problem statement.\n   3.3 Propose the methods and files to fix the issue and explain why.\n   3.4 From the possible file locations, select the most likely location to fix the issue.\n\nPhase 4. TEST CREATION: before implementing any fix, create a script to reproduce and verify the issue\n   4.1 Look at existing test files in the repository to understand the test format/structure.\n   4.2 Create a minimal reproduction script that reproduces the located issue.\n   4.3 Run the reproduction script with `cargo run` to confirm you are reproducing the issue.\n   4.4 Adjust the reproduction script as necessary.\n\nPhase 5. FIX ANALYSIS: state clearly the problem and how to fix it\n   5.1 State clearly what the problem is.\n   5.2 State clearly where the problem is located.\n   5.3 State clearly how the test reproduces the issue.\n   5.4 State clearly the best practices to take into account in the fix.\n   5.5 State clearly how to fix the problem.\n\nPhase 6. FIX IMPLEMENTATION: Edit the source code to implement your chosen solution.\n   6.1 Make minimal, focused changes to fix the issue.\n\nPhase 7. VERIFICATION: Test your implementation thoroughly.\n   7.1 Run your reproduction script to verify the fix works.\n   7.2 Add edge cases to your test script to ensure comprehensive coverage.\n   7.3 Run existing tests related to the modified code with `cargo test` to ensure you haven't broken anything.\n\nPhase 8. FINAL REVIEW: Carefully re-read the problem description and compare your changes with the base commit d68c3ec89a8efa304246467f80140c59467ba94f.\n   8.1 Ensure you've fully addressed all requirements.\n   8.2 Run any tests in the repository related to:\n      8.2.1 The issue you are fixing\n      8.2.2 The files you modified\n      8.2.3 The functions you changed\n   8.3 If any tests fail, revise your implementation until all tests pass.\n\nBe thorough in your exploration, testing, and reasoning. It's fine if your thinking process is lengthy - quality and completeness are more important than brevity.\n\nIMPORTANT CONSTRAINTS:\n- ONLY modify files within the /workspace/nushell directory\n- DO NOT navigate outside this directory (no `cd ..` or absolute paths to other locations)\n- DO NOT create, modify, or delete any files outside the repository\n- All your changes must be trackable by `git diff` within the repository\n- If you need to create test files, create them inside the repository directory\n", "memory": "16g", "runnable": false, "difficulty": "hard", "language": "", "cpus": 8, "instruction_truncated": false, "category": "software-development", "compose": false, "has_solution": true, "oracle": null, "docker_image": "", "taskset": "multi-swe-bench", "tags": ["rust", "issue-resolving", "nushell"]}, "runs": []}