Auto merge of #53124 - davidtwco:issue-52742, r=nikomatsakis
region error messages involving impls are confusing Part of #52742. r? @nikomatsakis
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14 changed files with 95 additions and 58 deletions
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex2b-push-no-existing-names.rs:16:5
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LL | fn foo(x: &mut Vec<Ref<i32>>, y: Ref<i32>) {
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| -------- -------- lifetime `'1` appears in this type
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| lifetime `'2` appears in this type
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| - - has type `Ref<'1, i32>`
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| has type `&mut std::vec::Vec<Ref<'2, i32>>`
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LL | x.push(y); //~ ERROR lifetime mismatch
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| ^^^^^^^^^ argument requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-both-are-structs-2.rs:16:5
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LL | fn foo(mut x: Ref, y: Ref) {
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| --- --- lifetime `'1` appears in this type
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| lifetime `'2` appears in this type
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| ----- - has type `Ref<'_, '1>`
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| has type `Ref<'_, '2>`
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LL | x.b = y.b; //~ ERROR lifetime mismatch
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| ^^^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,10 +8,10 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-both-are-structs-3.rs:16:5
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LL | fn foo(mut x: Ref) {
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| ---
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| lifetime `'1` appears in this type
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| lifetime `'2` appears in this type
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| -----
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| has type `Ref<'_, '1>`
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| has type `Ref<'2, '_>`
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LL | x.a = x.b; //~ ERROR lifetime mismatch
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| ^^^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,10 +8,10 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-both-are-structs-4.rs:16:5
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LL | fn foo(mut x: Ref) {
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| ---
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| lifetime `'1` appears in this type
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| lifetime `'2` appears in this type
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| -----
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| has type `Ref<'_, '1>`
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| has type `Ref<'2, '_>`
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LL | x.a = x.b; //~ ERROR lifetime mismatch
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| ^^^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-both-are-structs.rs:15:5
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LL | fn foo(mut x: Vec<Ref>, y: Ref) {
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| --- --- lifetime `'1` appears in this type
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| lifetime `'2` appears in this type
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| ----- - has type `Ref<'1>`
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| has type `std::vec::Vec<Ref<'2>>`
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LL | x.push(y); //~ ERROR lifetime mismatch
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| ^^^^^^^^^ argument requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-one-is-struct-2.rs:14:5
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LL | fn foo(mut x: Ref, y: &u32) {
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| --- - let's call the lifetime of this reference `'2`
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| lifetime `'1` appears in this type
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| ----- - let's call the lifetime of this reference `'2`
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| has type `Ref<'_, '1>`
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LL | y = x.b; //~ ERROR lifetime mismatch
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| ^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-one-is-struct-3.rs:14:5
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LL | fn foo(mut y: Ref, x: &u32) {
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| --- - let's call the lifetime of this reference `'1`
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| lifetime `'2` appears in this type
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| ----- - let's call the lifetime of this reference `'1`
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| has type `Ref<'_, '2>`
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LL | y.b = x; //~ ERROR lifetime mismatch
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| ^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-one-is-struct-4.rs:14:5
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LL | fn foo(mut y: Ref, x: &u32) {
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| --- - let's call the lifetime of this reference `'1`
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| lifetime `'2` appears in this type
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| ----- - let's call the lifetime of this reference `'1`
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| has type `Ref<'_, '2>`
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LL | y.b = x; //~ ERROR lifetime mismatch
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| ^^^^^^^ requires that `'1` must outlive `'2`
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@ -8,9 +8,9 @@ error: unsatisfied lifetime constraints
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--> $DIR/ex3-both-anon-regions-one-is-struct.rs:17:5
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LL | fn foo(mut x: Ref, y: &u32) {
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| --- - let's call the lifetime of this reference `'1`
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| lifetime `'2` appears in this type
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| ----- - let's call the lifetime of this reference `'1`
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| has type `Ref<'_, '2>`
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LL | x.b = y; //~ ERROR lifetime mismatch
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| ^^^^^^^ requires that `'1` must outlive `'2`
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31
src/test/ui/nll/issue-52742.rs
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31
src/test/ui/nll/issue-52742.rs
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@ -0,0 +1,31 @@
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(nll)]
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#![feature(in_band_lifetimes)]
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#![feature(impl_header_lifetime_elision)]
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struct Foo<'a, 'b> {
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x: &'a u32,
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y: &'b u32,
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}
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struct Bar<'b> {
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z: &'b u32
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}
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impl Foo<'_, '_> {
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fn take_bar(&mut self, b: Bar<'_>) {
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self.y = b.z
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//~^ ERROR unsatisfied lifetime constraints
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}
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}
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fn main() { }
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12
src/test/ui/nll/issue-52742.stderr
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12
src/test/ui/nll/issue-52742.stderr
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@ -0,0 +1,12 @@
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error: unsatisfied lifetime constraints
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--> $DIR/issue-52742.rs:26:9
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LL | fn take_bar(&mut self, b: Bar<'_>) {
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| --------- -- let's call this `'1`
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| has type `&mut Foo<'_, '2>`
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LL | self.y = b.z
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| ^^^^^^^^^^^^ requires that `'1` must outlive `'2`
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error: aborting due to previous error
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