I've seen something similar recently, with this code:
----------------------------------------------------------------------
fn main() {
// Fails.
assert_eq!(stuff(), &[]);
// Works
let tmp: &'static [uint] = &[];
assert_eq!(stuff(), tmp);
}
static simple: &'static [uint] = &[1, 2];
fn stuff() -> &'static [uint] {
simple
}
----------------------------------------------------------------------
The failing code worked a week or so ago. Similar issue in that I can
make it work by giving an explicit type for the literal array.
David
On Sat, Aug 30, 2014 at 04:52:00PM +0800, Kai Noda wrote:
Hi Rusters,
I'm very new to Rust, so I'd like you to check if this is really a
compiler bug or not.
fn main() {
let s1 = &[0i];
{
let s2 = &[0i];
let s3 = if true { s1 } else { s2 };
};
}
[1]http://is.gd/NCeGpl
<anon>:5:19: 5:23 error: borrowed value does not live long enough
<anon>:5 let s2 = &[0i];
^~~~
<anon>:2:11: 8:2 note: reference must be valid for the block at 2:10...
<anon>:2 fn main() {
<anon>:3 let s1 = &[0i];
<anon>:4 {
<anon>:5 let s2 = &[0i];
<anon>:6 let s3 = if true { s1 } else { s2 };
<anon>:7 };
...
<anon>:4:5: 7:6 note: ...but borrowed value is only valid for the block at 4:4
<anon>:4 {
<anon>:5 let s2 = &[0i];
<anon>:6 let s3 = if true { s1 } else { s2 };
<anon>:7 };
error: aborting due to previous error
Seems like s1 and s2 are inferred as &[int, ..1] and when I manually
type them as &[int], it successfully compiles.
fn main() {
let s1: &[int] = &[0i];
{
let s2: &[int] = &[0i];
let s3 = if true { s1 } else { s2 };
};
}
Putting s1 and s2 into a single block also satisfies the compiler.
fn main() {
let s1 = &[0i];
let s2 = &[0i];
let s3 = if true { s1 } else { s2 };
}
I came from C++ and I think the way I take reference of a fixed vector
literal is correct.
[2]http://doc.rust-lang.org/rust.html#pointer-types
I was originally trying to fix this line which doesn't compile with
the nightly build of Rust:
[3]https://github.com/servo/rust-url/blob/master/src/form_urlencoded.rs#L55
No similar issue is filed here:
[4]https://github.com/rust-lang/rust/labels/A-lifetimes
Best regards,
Kai
野田 開 <[5][email protected]>
References
Visible links
1. http://is.gd/NCeGpl
2. http://doc.rust-lang.org/rust.html#pointer-types
3. https://github.com/servo/rust-url/blob/master/src/form_urlencoded.rs#L55
4. https://github.com/rust-lang/rust/labels/A-lifetimes
5. mailto:[email protected]
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