unresolved import: could not find hashmap in std.

[adnelson]

I'm a Rust beginner trying to write some code which uses a HashMap.

As per this documentation, I have this line:

use std::hashmap::HashMap;

And I get this error message when trying to compile:

$ rustc -v
rustc 0.11.0-pre (0ee6a8e 2014-06-09 23:41:53 -0700)
host: x86_64-apple-darwin
$ rustc foo.rs
foo.rs:1:5: 1:26 error: unresolved import: could not find `hashmap` in `std`.
foo.rs:1 use std::hashmap::HashMap;
            ^~~~~~~~~~~~~~~~~~~~~
foo.rs:1:5: 1:26 error: failed to resolve import `std::hashmap::HashMap`
foo.rs:1 use std::hashmap::HashMap;
            ^~~~~~~~~~~~~~~~~~~~~
error: aborting due to 2 previous errors

I'm really struggling to find how to solve this error; I don't really know about rust's package management system, I don't know how to browse what I have or to install something that I don't have, and reading guides is frustrating because they always seem to be out of date. Can anyone help me with this? How do I get a hash map in rust?

[adnelson]

The fix was to use the import statement use std::collections::hashmap::HashMap;.

[homeworkprod]

For the record, because I (being a Rust beginner) had trouble importing HashMap as well, and I came across this issue which helped me to find the solution:

On Rust 0.10, this is what works for me:

extern crate collections;
use collections::hashmap::HashMap;

[huonw]

The fix was to use the import statement use std::collections::hashmap::HashMap;.

FWIW, it's reexported as std::collections::HashMap.