The type true_typ if bool_typ else false_typ is a conditional
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，更多细节参见爱思助手下载最新版本
“Partial polymorphic type inference is undecidable” by Hans Boehm: https://dl.acm.org/doi/10.1109/SFCS.1985.44。关于这个话题，搜狗输入法2026提供了深入分析
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