Type inference fails on FromIterator trait using basic range.

[cameron-rowe]

The type inference of FromIterator seems to fail, even though the type of range is correctly deduced.

use std::iter::FromIterator;
fn main() {
    let v = Vec::from_iter(0..10);
    println!("v: {:?}", v);
}

Explicitly stating the type of the range seems to fix the issue.

use std::iter::FromIterator;
fn main() {
    let v = Vec::from_iter(0i32..10);
    println!("v: {:?}", v);
}

[flodiebold]

Duplicate of #4072, I think.