scala:跟踪隐含选择和其他代码魔法 [英] scala: tracing implicits selection and other code magics

问题描述

当试图弄清楚库的工作原理时，隐式转换令人困惑.例如，看一个像 'val foo: Foo = 1' 这样的表达式，什么将 1 转换为 Foo?

When trying to figure how a library works, implicit conversions are confusing. For example, looking at an expression like 'val foo: Foo = 1', what converts 1 to Foo?

是否可以指示 Scala 库(或 REPL)打印出在评估表达式时正在执行的代码路径?

Is it possible to instruct the scala library (or REPL) to print out the code paths that are executing while evaluating an expression?

推荐答案

您可以在编译器命令行中添加-Xprint:typer"(或为 Swing GUI 浏览器添加-Ybrowse:typer")以查看代码显式应用的转换.

You can add "-Xprint:typer" to the compiler command line (or "-Ybrowse:typer" for a swing GUI browser) to see the code with the conversions explicitly applied.

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