Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Implement a 10-rule config-file parser (quotes, continuations, interpolation, cycles) from a written spec

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  "result": "I've implemented `parse` and `getbool` in `rconf.py` using only the standard library, and kept the `RConfError(msg, line)` signature. My own edge-case tests all pass (they're in `/tmp/rt`, outside your folder). pytest isn't installed here, so I ran them with a small standard-library stand-in. I haven't tested against the real grading suite.\n\n**Error line numbers:**\n- Parse errors report the line they happen on.\n- An unknown reference reports the line where that key was defined. For a value continued over several lines, that's the line with the key on it.\n- A reference cycle reports the line of a value in the cycle.\n\n**Where the spec was unclear, I chose:**\n- **Indented lines:** a line starting with whitespace is always treated as a continuation. So an indented line at the very top of the file, or after a blank line, comment or section header, is an error rather than being read as a normal key line. An indented `# ...` is still just a comment.\n- **Continuing a quoted value:** this is an error, since rule 7 only allows continuing unquoted values.\n- **Comments on continuation lines:** inline comments are removed there too.\n- **Continuing an empty value:** `a =` followed by `  x` gives `\"x\"`, without a leading space.\n- **References:** `${a.b.c}` splits at the first dot (section `a`, key `b.c`). References are case-insensitive. An unclosed `${` is an error. A `$` not followed by `$` or `{` is kept as a plain `$`.\n- **Section headers:** `[sec] # comment` is allowed, but other text after `]` is an error.\n- **Sections in the result:** an empty `[section]` still appears in the result as `{}`. The `\"\"` section only appears if some key comes before the first header.\n- **Text after a closing quote:** `\"x\"#y` is an error, because an inline comment needs whitespace before the `#` or `;`.\n- **`getbool`:**\n  - It raises `RConfError` with `line=None` for a value that isn't a boolean and for a missing key, because the plain dict it receives no longer has line numbers.\n  - Section and key lookups ignore case.\n- **Input handling:** a leading UTF-8 byte-order mark is stripped, and `bytes` input is decoded as UTF-8.",
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