Lint elided lifetimes in path during lifetime resolution.

src/test/ui/in-band-lifetimes/elided-lifetimes.fixed

@@ -5,23 +5,24 @@
 #![deny(elided_lifetimes_in_paths)]
 //~^ NOTE the lint level is defined here
 
-use std::cell::{RefCell, Ref};
+use std::cell::{Ref, RefCell};
 
-
-struct Foo<'a> { x: &'a u32 }
+struct Foo<'a> {
+    x: &'a u32,
+}
 
 fn foo(x: &Foo<'_>) {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
 }
 
 fn bar(x: &Foo<'_>) {}
 
-
 struct Wrapped<'a>(&'a str);
 
 struct WrappedWithBow<'a> {
-    gift: &'a str
+    gift: &'a str,
 }
 
 struct MatchedSet<'a, 'b> {
@@ -31,19 +32,22 @@ struct MatchedSet<'a, 'b> {
 
 fn wrap_gift(gift: &str) -> Wrapped<'_> {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     Wrapped(gift)
 }
 
 fn wrap_gift_with_bow(gift: &str) -> WrappedWithBow<'_> {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     WrappedWithBow { gift }
 }
 
 fn inspect_matched_set(set: MatchedSet<'_, '_>) {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected 2 lifetime parameters
+    //~| HELP consider using the `'_` lifetime
     println!("{} {}", set.one, set.another);
 }
 
@@ -55,7 +59,8 @@ macro_rules! autowrapper {
 
         fn $fn_name(gift: &str) -> $type_name<'_> {
             //~^ ERROR hidden lifetime parameters in types are deprecated
-            //~| HELP indicate the anonymous lifetime
+            //~| NOTE expected named lifetime parameter
+            //~| HELP consider using the `'_` lifetime
             $type_name { gift }
         }
     }
@@ -69,7 +74,8 @@ macro_rules! anytuple_ref_ty {
     ($($types:ty),*) => {
         Ref<'_, ($($types),*)>
         //~^ ERROR hidden lifetime parameters in types are deprecated
-        //~| HELP indicate the anonymous lifetime
+        //~| NOTE expected named lifetime parameter
+        //~| HELP consider using the `'_` lifetime
     }
 }
 
@@ -77,7 +83,8 @@ fn main() {
     let honesty = RefCell::new((4, 'e'));
     let loyalty: Ref<'_, (u32, char)> = honesty.borrow();
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     let generosity = Ref::map(loyalty, |t| &t.0);
 
     let laughter = RefCell::new((true, "magic"));

src/test/ui/in-band-lifetimes/elided-lifetimes.rs

@@ -5,23 +5,24 @@
 #![deny(elided_lifetimes_in_paths)]
 //~^ NOTE the lint level is defined here
 
-use std::cell::{RefCell, Ref};
+use std::cell::{Ref, RefCell};
 
-
-struct Foo<'a> { x: &'a u32 }
+struct Foo<'a> {
+    x: &'a u32,
+}
 
 fn foo(x: &Foo) {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
 }
 
 fn bar(x: &Foo<'_>) {}
 
-
 struct Wrapped<'a>(&'a str);
 
 struct WrappedWithBow<'a> {
-    gift: &'a str
+    gift: &'a str,
 }
 
 struct MatchedSet<'a, 'b> {
@@ -31,19 +32,22 @@ struct MatchedSet<'a, 'b> {
 
 fn wrap_gift(gift: &str) -> Wrapped {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     Wrapped(gift)
 }
 
 fn wrap_gift_with_bow(gift: &str) -> WrappedWithBow {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     WrappedWithBow { gift }
 }
 
 fn inspect_matched_set(set: MatchedSet) {
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected 2 lifetime parameters
+    //~| HELP consider using the `'_` lifetime
     println!("{} {}", set.one, set.another);
 }
 
@@ -55,7 +59,8 @@ macro_rules! autowrapper {
 
         fn $fn_name(gift: &str) -> $type_name {
             //~^ ERROR hidden lifetime parameters in types are deprecated
-            //~| HELP indicate the anonymous lifetime
+            //~| NOTE expected named lifetime parameter
+            //~| HELP consider using the `'_` lifetime
             $type_name { gift }
         }
     }
@@ -69,7 +74,8 @@ macro_rules! anytuple_ref_ty {
     ($($types:ty),*) => {
         Ref<($($types),*)>
         //~^ ERROR hidden lifetime parameters in types are deprecated
-        //~| HELP indicate the anonymous lifetime
+        //~| NOTE expected named lifetime parameter
+        //~| HELP consider using the `'_` lifetime
     }
 }
 
@@ -77,7 +83,8 @@ fn main() {
     let honesty = RefCell::new((4, 'e'));
     let loyalty: Ref<(u32, char)> = honesty.borrow();
     //~^ ERROR hidden lifetime parameters in types are deprecated
-    //~| HELP indicate the anonymous lifetime
+    //~| NOTE expected named lifetime parameter
+    //~| HELP consider using the `'_` lifetime
     let generosity = Ref::map(loyalty, |t| &t.0);
 
     let laughter = RefCell::new((true, "magic"));

src/test/ui/in-band-lifetimes/elided-lifetimes.stderr

@@ -1,60 +1,92 @@
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:13:12
+  --> $DIR/elided-lifetimes.rs:14:12
    |
 LL | fn foo(x: &Foo) {
-   |            ^^^- help: indicate the anonymous lifetime: `<'_>`
+   |            ^^^ expected named lifetime parameter
    |
 note: the lint level is defined here
   --> $DIR/elided-lifetimes.rs:5:9
    |
 LL | #![deny(elided_lifetimes_in_paths)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+help: consider using the `'_` lifetime
+   |
+LL | fn foo(x: &Foo<'_>) {
+   |            ~~~~~~~
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:32:29
+  --> $DIR/elided-lifetimes.rs:33:29
    |
 LL | fn wrap_gift(gift: &str) -> Wrapped {
-   |                             ^^^^^^^- help: indicate the anonymous lifetime: `<'_>`
+   |                             ^^^^^^^ expected named lifetime parameter
+   |
+help: consider using the `'_` lifetime
+   |
+LL | fn wrap_gift(gift: &str) -> Wrapped<'_> {
+   |                             ~~~~~~~~~~~
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:38:38
+  --> $DIR/elided-lifetimes.rs:40:38
    |
 LL | fn wrap_gift_with_bow(gift: &str) -> WrappedWithBow {
-   |                                      ^^^^^^^^^^^^^^- help: indicate the anonymous lifetime: `<'_>`
+   |                                      ^^^^^^^^^^^^^^ expected named lifetime parameter
+   |
+help: consider using the `'_` lifetime
+   |
+LL | fn wrap_gift_with_bow(gift: &str) -> WrappedWithBow<'_> {
+   |                                      ~~~~~~~~~~~~~~~~~~
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:44:29
+  --> $DIR/elided-lifetimes.rs:47:29
    |
 LL | fn inspect_matched_set(set: MatchedSet) {
-   |                             ^^^^^^^^^^- help: indicate the anonymous lifetimes: `<'_, '_>`
+   |                             ^^^^^^^^^^ expected 2 lifetime parameters
+   |
+help: consider using the `'_` lifetime
+   |
+LL | fn inspect_matched_set(set: MatchedSet<'_, '_>) {
+   |                             ~~~~~~~~~~~~~~~~~~
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:56:36
+  --> $DIR/elided-lifetimes.rs:60:36
    |
 LL |         fn $fn_name(gift: &str) -> $type_name {
-   |                                    ^^^^^^^^^^- help: indicate the anonymous lifetime: `<'_>`
+   |                                    ^^^^^^^^^^ expected named lifetime parameter
 ...
 LL | autowrapper!(Autowrapped, autowrap_gift, 'a);
    | -------------------------------------------- in this macro invocation
    |
    = note: this error originates in the macro `autowrapper` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using the `'_` lifetime
+   |
+LL |         fn $fn_name(gift: &str) -> $type_name<'_> {
+   |                                    ~~~~~~~~~~~~~~
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:78:18
+  --> $DIR/elided-lifetimes.rs:84:22
    |
 LL |     let loyalty: Ref<(u32, char)> = honesty.borrow();
-   |                  ^^^^^^^^^^^^^^^^ help: indicate the anonymous lifetime: `Ref<'_, (u32, char)>`
+   |                      ^ expected named lifetime parameter
+   |
+help: consider using the `'_` lifetime
+   |
+LL |     let loyalty: Ref<'_, (u32, char)> = honesty.borrow();
+   |                      +++
 
 error: hidden lifetime parameters in types are deprecated
-  --> $DIR/elided-lifetimes.rs:70:9
+  --> $DIR/elided-lifetimes.rs:75:13
    |
 LL |         Ref<($($types),*)>
-   |         ^^^^^^^^^^^^^^^^^^ help: indicate the anonymous lifetime: `Ref<'_, ($($types),*)>`
+   |             ^ expected named lifetime parameter
 ...
 LL |     let yellow: anytuple_ref_ty!(bool, &str) = laughter.borrow();
    |                 ---------------------------- in this macro invocation
    |
    = note: this error originates in the macro `anytuple_ref_ty` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using the `'_` lifetime
+   |
+LL |         Ref<'_, ($($types),*)>
+   |             +++
 
 error: aborting due to 7 previous errors
 

src/test/ui/lint/force-warn/allowed-by-default-lint.stderr

@@ -2,9 +2,13 @@ warning: hidden lifetime parameters in types are deprecated
   --> $DIR/allowed-by-default-lint.rs:9:12
    |
 LL | fn foo(x: &Foo) {}
-   |            ^^^- help: indicate the anonymous lifetime: `<'_>`
+   |            ^^^ expected named lifetime parameter
    |
    = note: requested on the command line with `--force-warn elided-lifetimes-in-paths`
+help: consider using the `'_` lifetime
+   |
+LL | fn foo(x: &Foo<'_>) {}
+   |            ~~~~~~~
 
 warning: 1 warning emitted
 

src/test/ui/lint/reasons.rs

@@ -1,7 +1,6 @@
 // check-pass
 
 #![feature(lint_reasons)]
-
 #![warn(elided_lifetimes_in_paths,
         //~^ NOTE the lint level is defined here
         reason = "explicit anonymous lifetimes aid reasoning about ownership")]
@@ -20,8 +19,9 @@ pub struct CheaterDetectionMechanism {}
 impl fmt::Debug for CheaterDetectionMechanism {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         //~^ WARN hidden lifetime parameters in types are deprecated
+        //~| NOTE expected named lifetime parameter
         //~| NOTE explicit anonymous lifetimes aid
-        //~| HELP indicate the anonymous lifetime
+        //~| HELP consider using the `'_` lifetime
         fmt.debug_struct("CheaterDetectionMechanism").finish()
     }
 }

src/test/ui/lint/reasons.stderr

@@ -1,15 +1,19 @@
 warning: hidden lifetime parameters in types are deprecated
-  --> $DIR/reasons.rs:21:29
+  --> $DIR/reasons.rs:20:29
    |
 LL |     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-   |                             ^^^^^^^^^^^^^^- help: indicate the anonymous lifetime: `<'_>`
+   |                             ^^^^^^^^^^^^^^ expected named lifetime parameter
    |
    = note: explicit anonymous lifetimes aid reasoning about ownership
 note: the lint level is defined here
-  --> $DIR/reasons.rs:5:9
+  --> $DIR/reasons.rs:4:9
    |
 LL | #![warn(elided_lifetimes_in_paths,
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+help: consider using the `'_` lifetime
+   |
+LL |     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+   |                             ~~~~~~~~~~~~~~~~~~
 
 warning: variable `Social_exchange_psychology` should have a snake case name
   --> $DIR/reasons.rs:30:9
@@ -20,7 +24,7 @@ LL |     let Social_exchange_psychology = CheaterDetectionMechanism {};
    = note: people shouldn't have to change their usual style habits
            to contribute to our project
 note: the lint level is defined here
-  --> $DIR/reasons.rs:9:5
+  --> $DIR/reasons.rs:8:5
    |
 LL |     nonstandard_style,
    |     ^^^^^^^^^^^^^^^^^