Walkthrough

This PR systematically replaces unreachable!() macros with unimplemented!() in py_new/slot_new implementations across builtin and stdlib modules, removes identifier from prelude imports in several files, and adds targeted lint-suppression attributes for existing code patterns.

Changes

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20–25 minutes

• Attention areas: Verify that the identifier import removals do not break compile-time macro resolution in affected files (especially builtins/complex.rs, builtins/type.rs, function/protocol.rs, stdlib/operator.rs); confirm that moving identifier resolution to alternate import paths does not introduce unintended symbol shadowing or missing references.
• Cross-check that the unreachable! → unimplemented! swaps maintain consistent error handling patterns and do not mask legitimate control-flow assumptions elsewhere in the codebase.

Possibly related PRs

• Fix nightly clippy warnings #5803 — Modifies overlapping files and the same functions (e.g., PyBaseObject::py_new) with stylistic and diagnostic changes to panic messages.
• ctypes struct/union/array #6309 — Affects multiple ctypes module files (array.rs, base.rs, pointer.rs, structure.rs, union.rs) with similar py_new constructor modifications.
• Fix import ctypes #6304 — Modifies ctypes module constructor code (PyCArray::py_new, etc.) alongside other py_new slot implementations.

Suggested reviewers

• ShaharNaveh
• arihant2math
• coolreader18

Poem

🐰 Hops through the code with careful care,
Swapping unreachable for paths more fair;
Unimplemented shines bright and true,
Imports trimmed down, control flow renewed!
With lint flags placed and logic preserved,
This refactor's rewards are well-deserved!

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