[clang-tools-extra] Enforce SL.con.3: Add check to replace operator[] with at() [Cont.] (PR #95220)

[Paul Heidekrüger via cfe-commits]

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+// RUN: %check_clang_tidy -std=c++2b -check-suffix=DEFAULT %s \
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paulhdk wrote:

Nice! Addressed in 642f5c311701e1476e84ddb04eb84105c75678a5.

Also discovered `check_clang_tidy.py`'s `-check-suffixes` option which came in handy.

https://github.com/llvm/llvm-project/pull/95220