Walkthrough

Updated the sys module's unraisable-exception hook: prints traceback via exc_traceback using Python's traceback.print_tb, improves exception type and value formatting (module name, qualname, surrogate-safe value), adds colon/newline formatting and stderr flush, and adds KwArgs to imported function types.

Changes

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Inspect exc_traceback None handling and call to traceback.print_tb.
• Verify module name filtering logic for builtins and __main__.
• Confirm qualname fallback and surrogate-safe str() fallback behave correctly.
• Ensure stderr flush occurs after all writes.

Possibly related PRs

• Unraiseable traceback #6449 — Similar modifications to crates/vm/src/stdlib/sys.rs adding KwArgs and improving unraisable traceback printing and formatting.

Poem

🐰 I hopped through code, found traces to show,
A traceback now prints where silent errors go.
Module names, qualnames, each line in its place,
A flushed little message, tidy and ace.
Hooray — the hook sings, and I twitch my nose.

Pre-merge checks and finishing touches

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