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Update introapp.rst

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Further explain why the App passed to ``run`` can't throw an exception.
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Tim Engler 2022-11-06 09:34:13 +08:00 committed by G. Allais
parent c6a8c9e7a7
commit 69f680e10a
1 changed files with 3 additions and 2 deletions
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docs/source/app/introapp.rst
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@ -103,5 +103,6 @@ Generalising the ``Path`` parameter with ``l``
means that we can invoke ``run`` for any application, whether the ``Path``
is ``NoThrow`` or ``MayThrow``. But, in practice, all applications
given to ``run`` will not throw at the top level, because the only
exception type available is the type ``AppHasIO``. Any exceptions
will have been introduced and handled inside the ``App``.
exception type available is the type ``AppHasIO``, which is an empty data
type (it has no values). Any exceptions will have been introduced and handled
inside the ``App``.