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<!DOCTYPE HTML>
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<title>Reglas de alcance - Rust por Ejemplo | DayronBG</title>
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<ol class="chapter"><li class="chapter-item affix "><a href="index.html">Introducción</a></li><li class="chapter-item "><a href="hello.html"><strong aria-hidden="true">1.</strong> Hola Mundo</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="hello/comment.html"><strong aria-hidden="true">1.1.</strong> Comentarios</a></li><li class="chapter-item "><a href="hello/print.html"><strong aria-hidden="true">1.2.</strong> Impresión formateada</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="hello/print/print_debug.html"><strong aria-hidden="true">1.2.1.</strong> Depuración</a></li><li class="chapter-item "><a href="hello/print/print_display.html"><strong aria-hidden="true">1.2.2.</strong> Mostrar</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="hello/print/print_display/testcase_list.html"><strong aria-hidden="true">1.2.2.1.</strong> Caso de prueba: Lista</a></li></ol></li><li class="chapter-item "><a href="hello/print/fmt.html"><strong aria-hidden="true">1.2.3.</strong> Formateo</a></li></ol></li></ol></li><li class="chapter-item "><a href="primitives.html"><strong aria-hidden="true">2.</strong> Primitivos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="primitives/literals.html"><strong aria-hidden="true">2.1.</strong> Literales y operadores</a></li><li class="chapter-item "><a href="primitives/tuples.html"><strong aria-hidden="true">2.2.</strong> Tuplas</a></li><li class="chapter-item "><a href="primitives/array.html"><strong aria-hidden="true">2.3.</strong> Arrays y Slices</a></li></ol></li><li class="chapter-item "><a href="custom_types.html"><strong aria-hidden="true">3.</strong> Tipos personalizados</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="custom_types/structs.html"><strong aria-hidden="true">3.1.</strong> Estructuras</a></li><li class="chapter-item "><a href="custom_types/enum.html"><strong aria-hidden="true">3.2.</strong> Enumeraciones</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="custom_types/enum/enum_use.html"><strong aria-hidden="true">3.2.1.</strong> uso</a></li><li class="chapter-item "><a href="custom_types/enum/c_like.html"><strong aria-hidden="true">3.2.2.</strong> Estilo C</a></li><li class="chapter-item "><a href="custom_types/enum/testcase_linked_list.html"><strong aria-hidden="true">3.2.3.</strong> Caso de prueba: lista enlazada</a></li></ol></li><li class="chapter-item "><a href="custom_types/constants.html"><strong aria-hidden="true">3.3.</strong> constantes</a></li></ol></li><li class="chapter-item "><a href="variable_bindings.html"><strong aria-hidden="true">4.</strong> Asignaciones de variables</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="variable_bindings/mut.html"><strong aria-hidden="true">4.1.</strong> Mutabilidad</a></li><li class="chapter-item "><a href="variable_bindings/scope.html"><strong aria-hidden="true">4.2.</strong> Alcance y enmascaramiento</a></li><li class="chapter-item "><a href="variable_bindings/declare.html"><strong aria-hidden="true">4.3.</strong> Declarar primero</a></li><li class="chapter-item "><a href="variable_bindings/freeze.html"><strong aria-hidden="true">4.4.</strong> Congelamiento</a></li></ol></li><li class="chapter-item "><a href="types.html"><strong aria-hidden="true">5.</strong> Tipos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="types/cast.html"><strong aria-hidden="true">5.1.</strong> Conversión de tipos</a></li><li class="chapter-item "><a href="types/literals.html"><strong aria-hidden="true">5.2.</strong> Literales</a></li><li class="chapter-item "><a href="types/inference.html"><strong aria-hidden="true">5.3.</strong> Inferencia</a></li><li class="chapter-item "><a href="types/alias.html"><strong aria-hidden="true">5.4.</strong> Alias</a></li></ol></li><li class="chapter-item "><a href="conversion.html"><strong aria-hidden="true">6.</strong> Conversión</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="conversion/from_into.html"><strong aria-hidden="true">6.1.</strong> From y Into</a></li><li class="chapter-item "><a href="conversion/try_from_try_into.html"><strong aria-hidden="true">6.2.</strong> TryFrom y TryInto</a></li><li class="chapter-item "><a href="conversion/string.html"><strong aria-hidden="true">6.3.</strong> A y desde Strings</a></li></ol></li><li class="chapter-item "><a href="expression.html"><strong aria-hidden="true">7.</strong> Expresiones</a></li><li class="chapter-item "><a href="flow_control.html"><strong aria-hidden="true">8.</strong> Flujo de control</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="flow_control/if_else.html"><strong aria-hidden="true">8.1.</strong> if/else</a></li><li class="chapter-item "><a href="flow_control/loop.html"><strong aria-hidden="true">8.2.</strong> bucle</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="flow_control/loop/nested.html"><strong aria-hidden="true">8.2.1.</strong> Anidación y etiquetas</a></li><li class="chapter-item "><a href="flow_control/loop/return.html"><strong aria-hidden="true">8.2.2.</strong> Salir de bucles</a></li></ol></li><li class="chapter-item "><a href="flow_control/while.html"><strong aria-hidden="true">8.3.</strong> while</a></li><li class="chapter-item "><a href="flow_control/for.html"><strong aria-hidden="true">8.4.</strong> for y rango</a></li><li class="chapter-item "><a href="flow_control/match.html"><strong aria-hidden="true">8.5.</strong> match</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="flow_control/match/destructuring.html"><strong aria-hidden="true">8.5.1.</strong> Desestructuración</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="flow_control/match/destructuring/destructure_tuple.html"><strong aria-hidden="true">8.5.1.1.</strong> tuplas</a></li><li class="chapter-item "><a href="flow_control/match/destructuring/destructure_slice.html"><strong aria-hidden="true">8.5.1.2.</strong> arrays/slices</a></li><li class="chapter-item "><a href="flow_control/match/destructuring/destructure_enum.html"><strong aria-hidden="true">8.5.1.3.</strong> enumeraciones</a></li><li class="chapter-item "><a href="flow_control/match/destructuring/destructure_pointers.html"><strong aria-hidden="true">8.5.1.4.</strong> punteros/ref</a></li><li class="chapter-item "><a href="flow_control/match/destructuring/destructure_structures.html"><strong aria-hidden="true">8.5.1.5.</strong> estructuras</a></li></ol></li><li class="chapter-item "><a href="flow_control/match/guard.html"><strong aria-hidden="true">8.5.2.</strong> Guardias</a></li><li class="chapter-item "><a href="flow_control/match/binding.html"><strong aria-hidden="true">8.5.3.</strong> Vinculación</a></li></ol></li><li class="chapter-item "><a href="flow_control/if_let.html"><strong aria-hidden="true">8.6.</strong> if let</a></li><li class="chapter-item "><a href="flow_control/let_else.html"><strong aria-hidden="true">8.7.</strong> let-else</a></li><li class="chapter-item "><a href="flow_control/while_let.html"><strong aria-hidden="true">8.8.</strong> while let</a></li></ol></li><li class="chapter-item "><a href="fn.html"><strong aria-hidden="true">9.</strong> Funciones</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="fn/methods.html"><strong aria-hidden="true">9.1.</strong> Métodos</a></li><li class="chapter-item "><a href="fn/closures.html"><strong aria-hidden="true">9.2.</strong> Cierres</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="fn/closures/capture.html"><strong aria-hidden="true">9.2.1.</strong> Captura</a></li><li class="chapter-item "><a href="fn/closures/input_parameters.html"><strong aria-hidden="true">9.2.2.</strong> Como parámetros de entrada</a></li><li class="chapter-item "><a href="fn/closures/anonymity.html"><strong aria-hidden="true">9.2.3.</strong> Anonimato de tipo</a></li><li class="chapter-item "><a href="fn/closures/input_functions.html"><strong aria-hidden="true">9.2.4.</strong> Funciones de entrada</a></li><li class="chapter-item "><a href="fn/closures/output_parameters.html"><strong aria-hidden="true">9.2.5.</strong> Como parámetros de salida</a></li><li class="chapter-item "><a href="fn/closures/closure_examples.html"><strong aria-hidden="true">9.2.6.</strong> Ejemplos en std</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="fn/closures/closure_examples/iter_any.html"><strong aria-hidden="true">9.2.6.1.</strong> Iterator::any</a></li><li class="chapter-item "><a href="fn/closures/closure_examples/iter_find.html"><strong aria-hidden="true">9.2.6.2.</strong> Búsqueda a través de iteradores</a></li></ol></li></ol></li><li class="chapter-item "><a href="fn/hof.html"><strong aria-hidden="true">9.3.</strong> Funciones de orden superior</a></li><li class="chapter-item "><a href="fn/diverging.html"><strong aria-hidden="true">9.4.</strong> Funciones divergentes</a></li></ol></li><li class="chapter-item "><a href="mod.html"><strong aria-hidden="true">10.</strong> Módulos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="mod/visibility.html"><strong aria-hidden="true">10.1.</strong> Visibilidad</a></li><li class="chapter-item "><a href="mod/struct_visibility.html"><strong aria-hidden="true">10.2.</strong> Visibilidad de estructuras</a></li><li class="chapter-item "><a href="mod/use.html"><strong aria-hidden="true">10.3.</strong> La declaración use</a></li><li class="chapter-item "><a href="mod/super.html"><strong aria-hidden="true">10.4.</strong> super y self</a></li><li class="chapter-item "><a href="mod/split.html"><strong aria-hidden="true">10.5.</strong> Jerarquía de archivos</a></li></ol></li><li class="chapter-item "><a href="crates.html"><strong aria-hidden="true">11.</strong> Crates</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="crates/lib.html"><strong aria-hidden="true">11.1.</strong> Creación de una biblioteca</a></li><li class="chapter-item "><a href="crates/using_lib.html"><strong aria-hidden="true">11.2.</strong> Uso de una biblioteca</a></li></ol></li><li class="chapter-item "><a href="cargo.html"><strong aria-hidden="true">12.</strong> Cargo</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="cargo/deps.html"><strong aria-hidden="true">12.1.</strong> Dependencias</a></li><li class="chapter-item "><a href="cargo/conventions.html"><strong aria-hidden="true">12.2.</strong> Convenciones</a></li><li class="chapter-item "><a href="cargo/test.html"><strong aria-hidden="true">12.3.</strong> Pruebas</a></li><li class="chapter-item "><a href="cargo/build_scripts.html"><strong aria-hidden="true">12.4.</strong> Scripts de construcción</a></li></ol></li><li class="chapter-item "><a href="attribute.html"><strong aria-hidden="true">13.</strong> Atributos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="attribute/unused.html"><strong aria-hidden="true">13.1.</strong> dead_code</a></li><li class="chapter-item "><a href="attribute/crate.html"><strong aria-hidden="true">13.2.</strong> Cajones</a></li><li class="chapter-item "><a href="attribute/cfg.html"><strong aria-hidden="true">13.3.</strong> cfg</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="attribute/cfg/custom.html"><strong aria-hidden="true">13.3.1.</strong> Personalizado</a></li></ol></li></ol></li><li class="chapter-item "><a href="generics.html"><strong aria-hidden="true">14.</strong> Genéricos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="generics/gen_fn.html"><strong aria-hidden="true">14.1.</strong> Funciones</a></li><li class="chapter-item "><a href="generics/impl.html"><strong aria-hidden="true">14.2.</strong> Implementación</a></li><li class="chapter-item "><a href="generics/gen_trait.html"><strong aria-hidden="true">14.3.</strong> Rasgos</a></li><li class="chapter-item "><a href="generics/bounds.html"><strong aria-hidden="true">14.4.</strong> Límites</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="generics/bounds/testcase_empty.html"><strong aria-hidden="true">14.4.1.</strong> Caso de prueba: límites vacíos</a></li></ol></li><li class="chapter-item "><a href="generics/multi_bounds.html"><strong aria-hidden="true">14.5.</strong> Múltiples límites</a></li><li class="chapter-item "><a href="generics/where.html"><strong aria-hidden="true">14.6.</strong> Cláusulas where</a></li><li class="chapter-item "><a href="generics/new_types.html"><strong aria-hidden="true">14.7.</strong> Nuevo Idioma de Tipos</a></li><li class="chapter-item "><a href="generics/assoc_items.html"><strong aria-hidden="true">14.8.</strong> Elementos asociados</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="generics/assoc_items/the_problem.html"><strong aria-hidden="true">14.8.1.</strong> El Problema</a></li><li class="chapter-item "><a href="generics/assoc_items/types.html"><strong aria-hidden="true">14.8.2.</strong> Tipos asociados</a></li></ol></li><li class="chapter-item "><a href="generics/phantom.html"><strong aria-hidden="true">14.9.</strong> Parámetros de tipo fantasma</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="generics/phantom/testcase_units.html"><strong aria-hidden="true">14.9.1.</strong> Caso de prueba: aclaración de unidades</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="scope.html" class="active"><strong aria-hidden="true">15.</strong> Reglas de alcance</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="scope/raii.html"><strong aria-hidden="true">15.1.</strong> RAII</a></li><li class="chapter-item "><a href="scope/move.html"><strong aria-hidden="true">15.2.</strong> Propiedad y movimientos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="scope/move/mut.html"><strong aria-hidden="true">15.2.1.</strong> Mutabilidad</a></li><li class="chapter-item "><a href="scope/move/partial_move.html"><strong aria-hidden="true">15.2.2.</strong> Movimientos parciales</a></li></ol></li><li class="chapter-item "><a href="scope/borrow.html"><strong aria-hidden="true">15.3.</strong> Préstamos</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="scope/borrow/mut.html"><strong aria-hidden="true">15.3.1.</strong> Mutabilidad</a></li><li class="chapter-item "><a href="scope/borrow/alias.html"><strong aria-hidden="true">15.3.2.</strong> Alias</a></li><li class="chapter-item "><a href="scope/borrow/ref.html"><strong aria-hidden="true">15.3.3.</strong> El patrón ref</a></li></ol></li><li class="chapter-item "><a href="scope/lifetime.html"><strong aria-hidden="true">15.4.</strong> Vidas</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="scope/lifetime/explicit.html"><strong aria-hidden="true">15.4.1.</strong> Anotación explícita</a></li><li class="chapter-item "><a href="scope/lifetime/fn.html"><strong aria-hidden="true">15.4.2.</strong> Funciones</a></li><li class="chapter-item "><a href="scope/lifetime/methods.html"><strong aria-hidden="true">15.4.3.</strong> Métodos</a></li><li class="chapter-item "><a href="scope/lifetime/struct.html"><strong aria-hidden="true">15.4.4.</strong> Estructuras</a></li><li class="chapter-item "><a href="scope/lifetime/trait.html"><strong aria-hidden="true">15.4.5.</strong> Traits</a></li><li class="chapter-item "><a href="scope/lifetime/lifetime_bounds.html"><strong aria-hidden="true">15.4.6.</strong> Límites</a></li><li class="chapter-item "><a href="scope/lifetime/lifetime_coercion.html"><strong aria-hidden="true">15.4.7.</strong> Coerción</a></li><li class="chapter-item "><a href="scope/lifetime/static_lifetime.html"><strong aria-hidden="true">15.4.8.</strong> Estático</a></li><li class="chapter-item "><a href="scope/lifetime/elision.html"><strong aria-hidden="true">15.4.9.</strong> Elisión</a></li></ol></li></ol></li><li class="chapter-item "><a href="trait.html"><strong aria-hidden="true">16.</strong> Traits</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="trait/derive.html"><strong aria-hidden="true">16.1.</strong> Derivar</a></li><li class="chapter-item "><a href="trait/dyn.html"><strong aria-hidden="true">16.2.</strong> Retorno de Traits con dyn</a></li><li class="chapter-item "><a href="trait/ops.html"><strong aria-hidden="true">16.3.</strong> Sobrecarga de Operadores</a></li><li class="chapter-item "><a href="trait/drop.html"><strong aria-hidden="true">16.4.</strong> Drop</a></li><li class="chapter-item "><a href="trait/iter.html"><strong aria-hidden="true">16.5.</strong> Iteradores</a></li><li class="chapter-item "><a href="trait/impl_trait.html"><strong aria-hidden="true">16.6.</strong> impl Trait</a></li><li class="chapter-item "><a href="trait/clone.html"><strong aria-hidden="true">16.7.</strong> Clonar</a></li><li class="chapter-item "><a href="trait/supertraits.html"><strong aria-hidden="true">16.8.</strong> Supertraits</a></li><li class="chapter-item "><a href="trait/disambiguating.html"><strong aria-hidden="true">16.9.</strong> Desambiguación de traits superpuestos</a></li></ol></li><li class="chapter-item "><a href="macros.html"><strong aria-hidden="true">17.</strong> macro_rules!</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="macros/syntax.html"><strong aria-hidden="true">17.1.</strong> Sintaxis</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="macros/designators.html"><strong aria-hidden="true">17.1.1.</strong> Designadores</a></li><li class="chapter-item "><a href="macros/overload.html"><strong aria-hidden="true">17.1.2.</strong> Sobrecarga</a></li><li class="chapter-item "><a href="macros/repeat.html"><strong aria-hidden="true">17.1.3.</strong> Repetición</a></li></ol></li><li class="chapter-item "><a href="macros/dry.html"><strong aria-hidden="true">17.2.</strong> DRY (No te repitas)</a></li><li class="chapter-item "><a href="macros/dsl.html"><strong aria-hidden="true">17.3.</strong> DSL (Lenguajes específicos del dominio)</a></li><li class="chapter-item "><a href="macros/variadics.html"><strong aria-hidden="true">17.4.</strong> Variadicidad</a></li></ol></li><li class="chapter-item "><a href="error.html"><strong aria-hidden="true">18.</strong> Manejo de Errores</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="error/panic.html"><strong aria-hidden="true">18.1.</strong> panic</a></li><li class="chapter-item "><a href="error/abort_unwind.html"><strong aria-hidden="true">18.2.</strong> abort y unwind</a></li><li class="chapter-item "><a href="error/option_unwrap.html"><strong aria-hidden="true">18.3.</strong> Option y unwrap</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="error/option_unwrap/question_mark.html"><strong aria-hidden="true">18.3.1.</strong> Desempaquetar opciones con ?</a></li><li class="chapter-item "><a href="error/option_unwrap/map.html"><strong aria-hidden="true">18.3.2.</strong> Combinadores: map</a></li><li class="chapter-item "><a href="error/option_unwrap/and_then.html"><strong aria-hidden="true">18.3.3.</strong> Combinadores: and_then</a></li><li class="chapter-item "><a href="error/option_unwrap/defaults.html"><strong aria-hidden="true">18.3.4.</strong> Valores predeterminados: or, or_else, get_or_insert, get_or_insert_with</a></li></ol></li><li class="chapter-item "><a href="error/result.html"><strong aria-hidden="true">18.4.</strong> Result</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="error/result/result_map.html"><strong aria-hidden="true">18.4.1.</strong> map para Result</a></li><li class="chapter-item "><a href="error/result/result_alias.html"><strong aria-hidden="true">18.4.2.</strong> Alias para Result</a></li><li class="chapter-item "><a href="error/result/early_returns.html"><strong aria-hidden="true">18.4.3.</strong> Retornos anticipados</a></li><li class="chapter-item "><a href="error/result/enter_question_mark.html"><strong aria-hidden="true">18.4.4.</strong> Introduciendo ?</a></li></ol></li><li class="chapter-item "><a href="error/multiple_error_types.html"><strong aria-hidden="true">18.5.</strong> Múltiples tipos de error</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="error/multiple_error_types/option_result.html"><strong aria-hidden="true">18.5.1.</strong> Extrayendo Results de Options</a></li><li class="chapter-item "><a href="error/multiple_error_types/define_error_type.html"><strong aria-hidden="true">18.5.2.</strong> Definiendo un tipo de error</a></li><li class="chapter-item "><a 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