compiler-errors - 无法构建插件示例

Question

我正在尝试构建 the plugin example从书中，但它不会工作:

rustc failed to resolve: could not find `quote` in `ext`

我该怎么办？该示例甚至没有任何构建说明。这是故意的吗？

Answer 1

code in the unstable book和 code in current source of rust是不同的。

在代码中，它说:

This code also appears in src/doc/unstable-book/src/language-features/plugin.md.

Please keep the two copies in sync! FIXME: have rustdoc read this file

但似乎直到现在还没有修复。

你的错误发生在不稳定书中的use syntax::ext::quote::rt::Span;，目前应该是use syntax_pos::Span;

由于这本书是针对 rust 中的不稳定特性，并且根据 top page of the book ,

Because this documentation relates to unstable features, we make no guarantees that what is contained here is accurate or up to date. It's developed on a best-effort basis. Each page will have a link to its tracking issue with the latest developments; you might want to check those as well.

因此，本书的其他代码也可能存在类似的问题。