错误：无法满足依赖关系，所以 `std` 只出现一次

Question

这是我尝试cargo test在项目中运行时遇到的错误。这是什么意思？我如何解决它？

我可以尝试更新更多细节，但不幸的是，我无法用最小的例子重现它......

完整错误：

cargo test
   Compiling ranges v0.1.0 (file:///Users/user/code/rust-project)
error: cannot satisfy dependencies so `std` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `core` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `collections` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `rustc_unicode` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `alloc` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `rand` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `libc` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `unwind` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot satisfy dependencies so `panic_unwind` only shows up once
  |
  = help: having upstream crates all available in one format will likely make this go away

error: cannot link together two allocators: alloc_jemalloc and alloc_system

error: aborting due to 10 previous errors

当我尝试运行通过使用箱测试期间编译步骤它发生extern crate：，喜欢这里如何访问文件的src目录从文件在我的测试目录？

在 OS X 上， rustc 1.12.0 (3191fbae9 2016-09-23)

Answer 1

感谢 Matthieu M. 为我指出正确的github 问题！

解决方法是将以下内容放入我的Cargo.toml：

crate-type = ["rlib", "dylib"]

如果您正在使用rustc该选项

-C prefer-dynamic

应该可以解决您的问题。