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This patch replaces the exception-based error propagation by the use of 'Attempt' return values, which eliminates side effects of the exception handling - cxx_heap allocations - from code paths that are used by the the cxx_heap itself (when growing the cxx_heap). It thereby fixes the failure of the sub_rm test at the "attach RAM ds to any position at sub rm - this should fail" step. Fixes #4953