Error cannot relate bound region when passing reference of function (stable version of rust) #109221
Labels
C-bug
Category: This is a bug.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
S-has-mcve
Status: A Minimal Complete and Verifiable Example has been found for this issue
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Comments
kittech0
added
C-bug
|
The current commit in the linked repo is Archived-Repositorie/hexevent@8403072 |
|
Standalone: rustc --crate-type=lib --test ice.rspub struct EventKey<I, C> {
invoker: I,
callbacks: Vec<C>,
}
impl<I, C> EventKey<I, C> {
pub fn new(invoker: I) -> EventKey<I, C> {
EventKey {
invoker,
callbacks: Vec::new(),
}
}
pub fn on_event(&mut self, callback: C) {
self.callbacks.push(callback);
}
pub fn invoke<'a, R>(&'a self) -> R
where
I: Fn(&'a [C]) -> R + 'a,
R: 'a,
C: 'a,
{
(self.invoker)(&self.callbacks)
}
}
#[cfg(test)]
mod tests {
use super::EventKey;
fn test(mut x: i32, y: i32, entries: &[&dyn Fn(i32)]) -> i32 {
for entry in entries {
x *= 3;
(entry)(x * y);
}
x * y
}
fn invoker<'a>(entries: &'a [&'a dyn Fn(i32)]) -> impl Fn(i32) -> i32 + 'a {
move |y| test(1, y, entries)
}
fn func(x: i32) {
println!("{}", x);
}
#[test]
fn it_works() {
let mut event_test = EventKey::new(invoker);
event_test.on_event(&func);
let result = event_test.invoke()(10);
assert_eq!(result, 30);
}
}@rustbot label +S-bug-has-mcve |
|
Can't reproduce on nightly: |
rustbot
added
the
S-has-mcve
|
This is fixed in latest nightly with sufficient tests. Closing in favor of #109361 which has an MCVE and to track a possible stable backport. |
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Code
The code can be found here https://github.com/JustFoxx/hexevent/blob/comtimeerror/src/lib.rs#L21
Meta
rustc --version --verbose:Error output
Backtrace
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