[oleksandr-pavlyk]

Nothing systematic here, but fix errors encounted outside of changeset of my PR in #10898

Description

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between f794a66 and 3995730.

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• cub/test/catch2_test_device_for_api.cu

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📝 Summary

Summary by CodeRabbit

• Tests
  • Improved consistency in CUDA extent handling and environment-based stream-routing tests.
  • Clarified test setup by marking local values and stream instances as immutable.
  • Updated asynchronous buffer allocation replacement tests for consistent stream handling.
• Refactor
  • Improved const-correctness in integer parsing and related test code.
  • Parsing behavior and sign/range handling remain unchanged.

Walkthrough

The changes add const qualification to unchanged CUDA test locals and to the signed-integer from_chars minus-sign flag.

Changes

Const qualification updates

Layer / File(s)	Summary
Immutable test values cub/test/catch2_test_device_for_api.cu, cub/test/catch2_test_device_for_env.cu, libcudacxx/test/libcudacxx/cuda/containers/uninitialized_async_buffer.cu	Extents objects and stream locals use const declarations.
Immutable parsing flag libcudacxx/include/cuda/std/__charconv/from_chars.h	Signed-integer parsing stores leading-minus detection in a const bool. Parsing and range handling remain unchanged.

Suggested reviewers: jacobfaib

Merge Risk: ⚪ Minimal · up to 39957

This change makes test locals and signed-integer sign detection immutable without altering parsing or test behavior. No current merge-blocking risk is identified.

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