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由 Niko Matsakis 提交于
the compiler that assumed two input types to assume two ouputs; we also have to teach `project.rs` to project `Output` from the unboxed closure and fn traits.
07cdb853
the compiler that assumed two input types to assume two ouputs; we also have to teach `project.rs` to project `Output` from the unboxed closure and fn traits.