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Nov 11, 2024
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Calldata doc #15533

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8 changes: 8 additions & 0 deletions docs/types/reference-types.rst
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Expand Up @@ -37,6 +37,14 @@ non-persistent area where function arguments are stored, and behaves mostly like
data location can also be returned from functions, but it is not possible to
allocate such types.

.. note::
Arrays and structs with ``calldata`` location declared in a function body
or as its return parameters must be assigned before being used or returned.
There are certain cases in which non-trivial control flow is used and the compiler
can't properly detect the initialization.
A common workaround in such cases is to assign the affected variable to itself before
the correct initialization takes place.

.. note::
Prior to version 0.6.9 data location for reference-type arguments was limited to
``calldata`` in external functions, ``memory`` in public functions and either
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