Guard::Runner.stopping_symbol_for

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Returns the symbol that has to be caught when running a supervised task.

@note If a Guard group is being run and it has the `:halt_on_fail`
  option set, this method returns :no_catch as it will be caught at the
  group level.
@see ._scoped_plugins

@param [Guard::Plugin] guard the Guard plugin to execute
@return [Symbol] the symbol to catch
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