Returns a RuleTrace starting with the first RuleTrace.Atomic element or the first sub-trace whose offset from the reported error index is zero (e.g. the RuleTrace.Terminal). If this is wrapped in one or more RuleTrace.NonTerminal.Named the outermost of these is returned instead.
Returns a RuleTrace starting with the first RuleTrace.Atomic element or the first sub-trace whose offset from the reported error index is zero (e.g. the RuleTrace.Terminal). If this is wrapped in one or more RuleTrace.NonTerminal.Named the outermost of these is returned instead.