[all-commits] [llvm/llvm-project] 9ebe6f: [lldb][test] Fix libstdc++ std::variant formatter ...

[Michael Buch via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9ebe6f9a1f9e3473166cd57282c9827df12416a3
      https://github.com/llvm/llvm-project/commit/9ebe6f9a1f9e3473166cd57282c9827df12416a3
  Author: Michael Buch <michaelbuch12 at gmail.com>
  Date:   2025-07-07 (Mon, 07 Jul 2025)

  Changed paths:
    M lldb/test/API/functionalities/data-formatter/data-formatter-stl/libstdcpp/variant/TestDataFormatterLibStdcxxVariant.py
    M lldb/test/API/functionalities/data-formatter/data-formatter-stl/libstdcpp/variant/main.cpp

  Log Message:
  -----------
  [lldb][test] Fix libstdc++ std::variant formatter tests for valueless variants (#147283)

A default-constructed variant has a valid index (being the first element
of the variant). The only case where the index is variant_npos is when
the variant is "valueless", which [according to
cppreference](https://en.cppreference.com/w/cpp/utility/variant/valueless_by_exception.html)
only happens when an exception is thrown during assignment to the
variant.

I adjusted the test to test that scenario, and the formatter seems to
work.

Unblocks https://github.com/llvm/llvm-project/pull/147253



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