如何在Scala中打印展开的宏? [英] How do I print an expanded macro in Scala?

问题描述

我正在Scala中编写宏，但是当我调用它时，我收到一条错误消息，提示"Double not not parameters".显然，宏如何构建AST有点问题.那我怎么看扩展的宏呢?有没有办法在运行时调用宏实现?

I am writing a macro in Scala, but when I call it I get an error message saying "Double does not take parameters". Clearly there is something wrong with how the macro builds the AST. So how can I see the expanded macro? Is there a way to call the macro implementation at runtime?

推荐答案

为编译器提供-Ymacro-debug-lite或-Ymacro-debug-verbose选项.

Provide -Ymacro-debug-lite or -Ymacro-debug-verbose option to the compiler.

在我的头上，打印的AST的报废行为由-Yshow-trees-compact，-Yshow-trees-stringified，-Xprint-types，-uniqid和-Yshow-symkinds控制.您可以通过运行scala -X和scala -Y(或在

Off the top of my head, detalization of printed ASTs is governed by -Yshow-trees-compact, -Yshow-trees-stringified, -Xprint-types, -uniqid and -Yshow-symkinds. You can find other gems by running scala -X and scala -Y (or inspecting the sources of scala settings at https://github.com/scala/scala/blob/2.10.x/src/compiler/scala/tools/nsc/settings/ScalaSettings.scala).

尽管本质上是一个宏，但它却具有自己的跟踪机制，可以由-Yreify-copypaste和-Yreify-debug进行配置.

Also, despite being essentially a macro, reification has its own tracing mechanism that can be configured by -Yreify-copypaste and -Yreify-debug.

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