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:t +在 Haskell 中,我们可以通过在终端输入来搜索表达式的类型,例如“+” 。
:t +
在 utop 中,我们如何确定诸如“+”之类的表达式的类型?我试过输入+ ;; utop,这会产生Error: Syntax error.
+ ;;
Error: Syntax error