feat(compiler): autorise la covariance du type de retour des overrides#48
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5pilow merged 1 commit intoJun 17, 2026
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Une méthode qui en surcharge une autre peut désormais réduire son type de retour à une sous-classe (covariance), comme en Java, au lieu d'exiger un type strictement identique. Les types des paramètres restent invariants. La covariance est limitée aux types classe, seul cas que le Java généré peut représenter via un retour covariant (u_Enfant extends u_Parent) ; Java n'autorise pas non plus la covariance entre primitifs (double -> long). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Mvgkm33dCbqx9fcGnhVk3E
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Une méthode qui en surcharge une autre peut désormais réduire son type de retour à une sous-classe (covariance), comme en Java, au lieu d'exiger un type strictement identique. Les types des paramètres restent invariants.
La covariance est limitée aux types classe, seul cas que le Java généré peut représenter via un retour covariant (u_Enfant extends u_Parent) ; Java n'autorise pas non plus la covariance entre primitifs (double -> long).
Claude-Session: https://claude.ai/code/session_01Mvgkm33dCbqx9fcGnhVk3E
closes #49