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