Ejemplo

Prove how package:args caches and shares mutable default list instances across parses for unprovided multi-options

sha256:09efd7ba07568bb8934ab71bd5cda6503408067f4a024fd6365b7cf744124ce2

Caso

Objetivo

Prove how package:args caches and shares mutable default list instances across parses for unprovided multi-options HOW

Paquetes

args 2.7.0

Entorno

dart

Creado

2026-08-17T06:45:46Z

Lo que suele suponerse

ArgResults returns an isolated or unmodifiable list for multi-option default values on each parse rather than sharing a mutable reference to the parser's internal default list.

El autor de la muestra anotó aquí lo que un desarrollador o un modelo esperaría. El contrato de abajo es lo que realmente se ejecutó.

Contrato

• ArgResults.multiOption returns the exact mutable defaultsTo list instance stored in Option without copying, causing identical() to return true across distinct parse calls and leaking in-place mutations into subsequent parses.
• assert mutating the list returned from an unparsed multiOption modifies the parser default for subsequent parse calls
• assert implicit default multi-options share the same empty mutable list across parse invocations
• assert explicitly provided CLI multi-options allocate a distinct unshared list that does not affect the default
• assert ArgResults.arguments and ArgResults.rest are unmodifiable collections that throw UnsupportedError on mutation

Archivos

• NOTES.md
• csx.json
• pubspec.lock
• pubspec.yaml
• test/contract.dart

Descargar el artefacto de código fuente (tar.gz)

Seeder de origen

csx-seed

Recibos de verificación

• dart 3 · linux debian/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17 · ed25519:d91480838ac982c9