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clarify when each field selector is used #506

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clarify when each field selector is used #506

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11 changes: 11 additions & 0 deletions src/expressions.rst
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Expand Up @@ -3504,6 +3504,17 @@ A :t:`container operand` is an :t:`operand` that indicates the :t:`value` whose
A :t:`field selector` is a :t:`construct` that selects the :t:`field` to be
accessed in a :t:`field access expression`.

:dp:`fls_T0cediM0OQ2P`
A :t:`field selector` can be:

* :dp:`fls_wmWAn6FjGcIO`
An :t:`indexed field selector`, used for :t:`[tuple]s`. Fields are accessed by their index,
starting from 0 and increasing sequentially.

* :dp:`fls_1eI5ubKhJiaq`
A :t:`named field selector`, used for :t:`[struct]s` and :t:`[union]s`.
Fields are accessed by their name.

:dp:`fls_qqrconpa92i3`
A :t:`selected field` is a :t:`field` that is selected by a
:t:`field access expression`.
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