tree 5f172349522f3c89d16f3eb2965a345d862333f6
parent 1f3a90f991780c5b3774004b9b14445b2a70e432
author Patrick Williams <patrick@stwcx.xyz> 1685030686 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1685033817 -0500

async: switch to stdexec async_scope

Use the `async_scope` implementation from stdexec instead of the
custom `scope` class here, which greatly reduces our own code and
also aligns better with the C++ STL direction.  The major changes are
around exception paths:

    - Spawned tasks which end with an exception will now std::terminate,
      so any task expected to throw should have an `upon_error` chain.

    - Spawned tasks which are stopped will be no longer throw an
      `UnexpectedStop` exception, so they should be chained with an
      `upon_stopped` if this is important.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4e0c85712652efa5b296b898dcc2b0026ba4c625