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07443e9776
This PR fixes the `ThrowingT` class, which currently fails to raise exceptions after a specified number of copy construction operations. The class is intended to throw in a controlled manner based on a specified counter value `throw_after`. However, its current implementation of the copy constructor fails to achieve this goal. The problem arises because the copy constructor does not initialize the `throw_after_n_` member, leaving `throw_after_n_` to default to `nullptr` as defined by the in-class initializer. As a result, its copy constructor always checks against `nullptr`, causing an immediate exception rather than throwing after the specified number `throw_after` of uses. The fix is straightforward: simply initialize the `throw_after_n_` member in the member initializer list. This issue was previously uncovered because all exception tests for `std::vector` in `exceptions.pass.cpp` used a `throw_after` value of 1, which coincidentally aligned with the class's behavior.