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由 Huon Wilson 提交于
Previously `ast::Arm` was always storing a single `ast::Expr` wrapped in an `ast::Block` (for historical reasons, AIUI), so we might as just store that expr directly. Closes #3085.
c3b90470
Previously `ast::Arm` was always storing a single `ast::Expr` wrapped in an `ast::Block` (for historical reasons, AIUI), so we might as just store that expr directly. Closes #3085.