Function selectExpressionAliasesNotUsedEarlier

selectExpressionAliasesNotUsedEarlier(
    query: {
        variables: readonly (
            | TermVariable
            | Wildcard
            | { expression: object; variable: TermVariable }
        )[];
    },
    astTransformer?: AstTransformer,
): 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 }
      )[];
  }
  The query whose select expressions to check.
  - variables: readonly (
        TermVariable
        | Wildcard
        | { expression: object; variable: TermVariable }
    )[]
    The variables and select expressions of the query.
- astTransformer: AstTransformer = transformer
  The transformer to traverse the select expressions with.
Returns void
- Defined in rules-sparql-1-1/lib/validation/validators.ts:402