e62599f856
This makes a small change as requested in code review, such that if there's
ambiguity in the self lifetime, we avoid lifetime elision entirely instead of
considering using lifetimes from any of the other parameters.
For example,
impl Something {
fn method(self: &Box<&Self>, something_else: &u32) -> &u32 { ... }
}
in standard Rust would have assumed the return lifetime was that of &Self;
with this PR prior to this commit would have chosen the lifetime of
'something_else', and after this commit would give an error message explaining
that the lifetime is ambiguous.
49 lines
1.1 KiB
Rust
49 lines
1.1 KiB
Rust
//@ edition:2018
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#![feature(arbitrary_self_types)]
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#![allow(non_snake_case)]
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use std::marker::PhantomData;
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use std::ops::Deref;
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use std::pin::Pin;
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struct Struct { }
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struct Wrap<T, P>(T, PhantomData<P>);
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impl<T, P> Deref for Wrap<T, P> {
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type Target = T;
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fn deref(&self) -> &T { &self.0 }
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}
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impl Struct {
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// Test using multiple `&Self`:
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async fn wrap_ref_Self_ref_Self(self: Wrap<&Self, &Self>, f: &u8) -> &u8 {
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//~^ ERROR missing lifetime specifier
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f
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}
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async fn box_wrap_ref_Self_ref_Self(self: Box<Wrap<&Self, &Self>>, f: &u32) -> &u32 {
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//~^ ERROR missing lifetime specifier
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f
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}
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async fn pin_wrap_ref_Self_ref_Self(self: Pin<Wrap<&Self, &Self>>, f: &u32) -> &u32 {
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//~^ ERROR missing lifetime specifier
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f
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}
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async fn box_box_wrap_ref_Self_ref_Self(self: Box<Box<Wrap<&Self, &Self>>>, f: &u32) -> &u32 {
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//~^ ERROR missing lifetime specifier
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f
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}
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async fn box_pin_wrap_ref_Self_ref_Self(self: Box<Pin<Wrap<&Self, &Self>>>, f: &u32) -> &u32 {
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//~^ ERROR missing lifetime specifier
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f
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}
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}
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fn main() { }
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