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35ec01a3
编写于
8月 20, 2013
作者:
B
Brandon Sanderson
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Clarify use_decl module resolution docs.
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@@ -851,6 +851,38 @@ In this example, the module `quux` re-exports all of the public names defined in
Also note that the paths contained in
`use`
items are relative to the crate root.
So, in the previous example, the
`use`
refers to
`quux::foo::*`
, and not simply to
`foo::*`
.
This also means that top-level module declarations should be at the crate root if direct usage
of the declared modules within
`use`
items is desired. It is also possible to use
`self`
and
`super`
at the beginning of a
`use`
item to refer to the current and direct parent modules respectively.
All rules regarding accessing declared modules in
`use`
declarations applies to both module declarations
and
`extern mod`
declarations.
An example of what will and will not work for
`use`
items:
~~~~
# #[allow(unused_imports)];
use foo::extra; // good: foo is at the root of the crate
use foo::baz::foobaz; // good: foo is at the root of the crate
mod foo {
extern mod extra;
use foo::extra::list; // good: foo is at crate root
// use extra::*; // bad: extra is not at the crate root
use self::baz::foobaz; // good: self refers to module 'foo'
use foo::bar::foobar; // good: foo is at crate root
pub mod bar {
pub fn foobar() { }
}
pub mod baz {
use super::bar::foobar; // good: super refers to module 'foo'
pub fn foobaz() { }
}
}
fn main() {}
~~~~
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