Is your feature request related to a problem? Please describe.

I wonder would it possible to have a {#try} logic block, such that anything goes inside, if error would be handled in the {:catch} block, eg:

{#try}
   <Component />
{:catch}
   <div>Fallback uI </div>
{/try}

if an error thrown during init / update in <Component />, then will see the Fallback UI instead.

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