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use std::ops::{Deref, DerefMut};
struct Thing;
trait Method<T> {
fn method(&self) -> T;
fn mut_method(&mut self) -> T;
}
impl Method<i32> for Thing {
fn method(&self) -> i32 { 0 }
fn mut_method(&mut self) -> i32 { 0 }
}
impl Method<u32> for Thing {
fn method(&self) -> u32 { 0 }
fn mut_method(&mut self) -> u32 { 0 }
}
trait MethodRef<T> {
fn by_self(self);
}
impl MethodRef<i32> for &Thing {
fn by_self(self) {}
}
impl MethodRef<u32> for &Thing {
fn by_self(self) {}
}
struct DerefsTo<T>(T);
impl<T> Deref for DerefsTo<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> DerefMut for DerefsTo<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
fn main() {
let mut thing = Thing;
thing.method(); //~ ERROR type annotations needed
thing.mut_method(); //~ ERROR type annotations needed
thing.by_self(); //~ ERROR type annotations needed
let mut deref_to = DerefsTo(Thing);
deref_to.method(); //~ ERROR type annotations needed
deref_to.mut_method(); //~ ERROR type annotations needed
deref_to.by_self(); //~ ERROR type annotations needed
let mut deref_deref_to = DerefsTo(DerefsTo(Thing));
deref_deref_to.method(); //~ ERROR type annotations needed
deref_deref_to.mut_method(); //~ ERROR type annotations needed
deref_deref_to.by_self(); //~ ERROR type annotations needed
}
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