Replace absl::nullopt with std::nullopt in p4-constraints - #196
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absl::optional is an alias for std::optional in C++17, and using std::nullopt directly aligns with standard library best practices. * ast.cc: Use std::nullopt in TypeBitwidth. * backend/constraint_info.cc: Use std::nullopt in ExtractConstraint, ParseConstraint table handling, and ExtractAttributeInfo. * backend/type_checker.cc: Use std::nullopt in LeastUpperBound. * copy.bara.sky: Remove obsolete protobuf replace rule and configure author mapping with sign-off for upstream export. Signed-off-by: verios-google <verios@google.com> PiperOrigin-RevId: 986185053
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Replace absl::nullopt with std::nullopt in p4-constraints
absl::optional is an alias for std::optional in C++17, and using std::nullopt directly aligns with standard library best practices.
Signed-off-by: verios-google verios@google.com