On 23/06/13 12:53, Ashish Myles wrote:
I have been out of rust for a bit, and coming back to it, I am having
a difficult time adapting the front page example at
http://www.rust-lang.org/ to the trunk version of rust (updated last
night). I turned the example to
--------
use std::*;
fn main() {
for ["Alice", "Bob", "Carol"].each |&name| {
do task::spawn {
let v = rand::rng().shuffle([1, 2, 3]);
for v.each |&num| {
io::print(fmt!("%s says: '%d'\n", name, num))
}
}
}
}
--------
and rustc complains with
--------
hello.rs:6:20: 6:51 error: type `std::rand::IsaacRng` does not
implement any method in scope named `shuffle`
hello.rs:6 let v = rand::rng().shuffle([1, 2, 3]);
--------
and a type inference error triggered by this part failing. In
libstd/rand.rs, RngUtil seems to be defined for everything
implementing Rng, which IsaacRng does. Is this a bug or is it some
change in the lookup?
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To use the methods from a trait, it has to be in scope, so:
use std::rand::{rng, RngUtil};
fn main() {
for ["Alice", "Bob", "Carol"].each |&name| {
do spawn {
let v = rng().shuffle([1, 2, 3]);
for v.each |&num| {
print(fmt!("%s says: '%d'\n", name, num))
}
}
}
}
seems to work with my rustc (ba05af7 2013-06-20 22:28:52 -0700).
(The reason many other traits don't need to be explicitly imported
is that they are exported from std::prelude, which is implicitly added
as `use std::prelude::*;` at the top of every mod.)
Huon
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