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Add documentation to SIL.rst for convert_function to clarify escaping… #15075

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Mar 8, 2018
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Add documentation to SIL.rst for convert_function to clarify escaping… #15075

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10 changes: 9 additions & 1 deletion docs/SIL.rst
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Expand Up @@ -4605,7 +4605,15 @@ in the following ways:
subclass of the source type's corresponding tuple element.

The function types may also differ in attributes, except that the
``convention`` attribute cannot be changed.
``convention`` attribute cannot be changed and the ``@noescape`` attribute must
not change for functions with context.

A ``convert_function`` cannot be used to change a thick type's ``@noescape``
attribute (``@noescape`` function types with context are not ABI compatible with
escaping function types with context) -- however, thin function types with and
without ``@noescape`` are ABI compatible because they have no context. To
convert from an escaping to a ``@noescape`` thick function type use
``convert_escape_to_noescape``.

convert_escape_to_noescape
```````````````````````````
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