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CMP0121
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.. versionadded:: 3.21
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The :command:`list` command now detects invalid indices.
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Prior to CMake version 3.21, the :command:`list` command's ``GET``,
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``INSERT``, ``SUBLIST``, and ``REMOVE_AT`` subcommands did not detect invalid
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index arguments.
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The ``OLD`` behavior of this policy is for invalid indices to be treated as
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their integer value (if any) at the start of the string. For example,
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``2good4you`` is a ``2`` and ``not_an_integer`` is a ``0``. The ``NEW``
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behavior is for invalid indices to trigger an error.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.21
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.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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