Explain malformed YAML front matter errors - #141
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Co-Authored-By: OpenAI GPT-6 (Codex) <noreply@openai.com>
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Fixes #127.
Loading YAML front matter with an unquoted colon in a plain-text value, such as
title: Assignment 1: Some Title, currently raises PyYAML's rawScannerError. The revised error names YAML front matter, includes the parser's line and column, and offers a quoting hint for this specific malformed-value case. Other YAML errors also get frontmatter context without that hint; the original PyYAML exception remains chained as the cause.The new regression test failed on current
mainand passes after the change. A valid quoted value remains unchanged.Validation:
pytest -q(59 passed),mypy frontmatter(4 source files clean), Python compilation, andgit diff --checkpassed locally under Python 3.13. AI assistance was used for the change and tests.