Function selectExpressionAliasesNotUsedEarlier

selectExpressionAliasesNotUsedEarlier(
    query: {
        variables: readonly (
            | TermVariable
            | Wildcard
            | { expression: object; variable: TermVariable }
        )[];
    },
): void
https://www.w3.org/TR/sparql12-query/#variableScope

In SELECT, the variable v must not be in-scope in the graph pattern of the SELECT clause, nor used in another select expression earlier in the clause.
Parameters
- query: {
      variables: readonly (
          | TermVariable
          | Wildcard
          | { expression: object; variable: TermVariable }
      )[];
  }
Returns void
- Defined in rules-sparql-1-1/lib/validation/validators.ts:379