selection failure: recompute applicable impls

src/test/ui/error-codes/E0282.rs

@@ -1,3 +1,4 @@
 fn main() {
-    let x = "hello".chars().rev().collect(); //~ ERROR E0282
+    let x = "hello".chars().rev().collect();
+    //~^ ERROR E0282
 }

src/test/ui/error-codes/E0401.rs

@@ -8,7 +8,9 @@ fn foo<T>(x: T) {
            W: Fn()>
            (y: T) { //~ ERROR E0401
     }
-    bfnr(x); //~ ERROR type annotations needed
+    bfnr(x);
+    //~^ ERROR type annotations needed
+    //~| ERROR type annotations needed
 }
 
 

src/test/ui/error-codes/E0401.stderr

@@ -21,7 +21,7 @@ LL |            (y: T) {
    |                ^ use of generic parameter from outer function
 
 error[E0401]: can't use generic parameters from outer function
-  --> $DIR/E0401.rs:22:25
+  --> $DIR/E0401.rs:24:25
    |
 LL | impl<T> Iterator for A<T> {
    | ---- `Self` type implicitly declared here, by this `impl`
@@ -43,7 +43,28 @@ help: consider specifying the generic arguments
 LL |     bfnr::<U, V, W>(x);
    |         +++++++++++
 
-error: aborting due to 4 previous errors
+error[E0283]: type annotations needed
+  --> $DIR/E0401.rs:11:5
+   |
+LL |     bfnr(x);
+   |     ^^^^ cannot infer type of the type parameter `W` declared on the function `bfnr`
+   |
+   = note: multiple `impl`s satisfying `_: Fn<()>` found in the following crates: `alloc`, `core`:
+           - impl<A, F> Fn<A> for &F
+             where A: Tuple, F: Fn<A>, F: ?Sized;
+           - impl<Args, F, A> Fn<Args> for Box<F, A>
+             where Args: Tuple, F: Fn<Args>, A: Allocator, F: ?Sized;
+note: required by a bound in `bfnr`
+  --> $DIR/E0401.rs:4:30
+   |
+LL |     fn bfnr<U, V: Baz<U>, W: Fn()>(y: T) {
+   |                              ^^^^ required by this bound in `bfnr`
+help: consider specifying the type arguments in the function call
+   |
+LL |     bfnr::<U, V, W>(x);
+   |         +++++++++++
 
-Some errors have detailed explanations: E0282, E0401.
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0282, E0283, E0401.
 For more information about an error, try `rustc --explain E0282`.

src/test/ui/impl-trait/cross-return-site-inference.rs

@@ -30,16 +30,19 @@ fn baa(b: bool) -> impl std::fmt::Debug {
 
 fn muh() -> Result<(), impl std::fmt::Debug> {
     Err("whoops")?;
-    Ok(()) //~ ERROR type annotations needed
+    Ok(())
+    //~^ ERROR type annotations needed
 }
 
 fn muh2() -> Result<(), impl std::fmt::Debug> {
-    return Err(From::from("foo")); //~ ERROR type annotations needed
+    return Err(From::from("foo"));
+    //~^ ERROR type annotations needed
     Ok(())
 }
 
 fn muh3() -> Result<(), impl std::fmt::Debug> {
-    Err(From::from("foo")) //~ ERROR type annotations needed
+    Err(From::from("foo"))
+    //~^ ERROR type annotations needed
 }
 
 fn main() {}

src/test/ui/impl-trait/cross-return-site-inference.stderr

@@ -10,7 +10,7 @@ LL |     Ok::<(), E>(())
    |       +++++++++
 
 error[E0282]: type annotations needed
-  --> $DIR/cross-return-site-inference.rs:37:12
+  --> $DIR/cross-return-site-inference.rs:38:12
    |
 LL |     return Err(From::from("foo"));
    |            ^^^ cannot infer type of the type parameter `E` declared on the enum `Result`
@@ -21,7 +21,7 @@ LL |     return Err::<(), E>(From::from("foo"));
    |               +++++++++
 
 error[E0282]: type annotations needed
-  --> $DIR/cross-return-site-inference.rs:42:5
+  --> $DIR/cross-return-site-inference.rs:44:5
    |
 LL |     Err(From::from("foo"))
    |     ^^^ cannot infer type of the type parameter `E` declared on the enum `Result`

src/test/ui/inference/cannot-infer-async.rs

@@ -10,6 +10,7 @@ fn main() {
     let fut = async {
         make_unit()?;
 
-        Ok(()) //~ ERROR type annotations needed
+        Ok(())
+        //~^ ERROR type annotations needed
     };
 }

src/test/ui/inference/cannot-infer-closure.rs

@@ -1,6 +1,7 @@
 fn main() {
     let x = |a: (), b: ()| {
         Err(a)?;
-        Ok(b) //~ ERROR type annotations needed
+        Ok(b)
+        //~^ ERROR type annotations needed
     };
 }

src/test/ui/inference/issue-71732.rs

@@ -15,7 +15,8 @@ use std::collections::hash_map::HashMap;
 
 fn foo(parameters: &HashMap<String, String>) -> bool {
     parameters
-        .get(&"key".into()) //~ ERROR: type annotations needed
+        .get(&"key".into())
+        //~^ ERROR type annotations needed
         .and_then(|found: &String| Some(false))
         .unwrap_or(false)
 }

src/test/ui/inference/issue-72616.rs

@@ -18,7 +18,8 @@ pub fn main() {
     }
     {
         if String::from("a") == "a".try_into().unwrap() {}
-        //~^ ERROR: type annotations needed
+        //~^ ERROR type annotations needed
+        //~| ERROR type annotations needed
     }
     {
         let _: String = match "_".try_into() {

src/test/ui/inference/issue-72616.stderr

@@ -16,6 +16,22 @@ help: try using a fully qualified path to specify the expected types
 LL |         if String::from("a") == <&str as TryInto<T>>::try_into("a").unwrap() {}
    |                                 +++++++++++++++++++++++++++++++   ~
 
-error: aborting due to previous error
+error[E0283]: type annotations needed
+  --> $DIR/issue-72616.rs:20:37
+   |
+LL |         if String::from("a") == "a".try_into().unwrap() {}
+   |                                     ^^^^^^^^
+   |
+   = note: multiple `impl`s satisfying `_: TryFrom<&str>` found in the following crates: `core`, `std`:
+           - impl<> TryFrom<&str> for std::sys_common::net::LookupHost;
+           - impl<T, U> TryFrom<U> for T
+             where U: Into<T>;
+   = note: required for `&str` to implement `TryInto<_>`
+help: try using a fully qualified path to specify the expected types
+   |
+LL |         if String::from("a") == <&str as TryInto<T>>::try_into("a").unwrap() {}
+   |                                 +++++++++++++++++++++++++++++++   ~
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0283`.

src/test/ui/inference/question-mark-type-infer.rs

@@ -7,7 +7,8 @@ fn f(x: &i32) -> Result<i32, ()> {
 
 fn g() -> Result<Vec<i32>, ()> {
     let l = [1, 2, 3, 4];
-    l.iter().map(f).collect()? //~ ERROR type annotations needed
+    l.iter().map(f).collect()?
+    //~^ ERROR type annotations needed
 }
 
 fn main() {

src/test/ui/issues/issue-71584.rs

@@ -1,5 +1,6 @@
 fn main() {
     let n: u32 = 1;
     let mut d: u64 = 2;
-    d = d % n.into(); //~ ERROR type annotations needed
+    d = d % n.into();
+    //~^ ERROR type annotations needed
 }

src/test/ui/traits/issue-77982.stderr

@@ -46,12 +46,7 @@ LL |     let ips: Vec<_> = (0..100_000).map(|_| u32::from(0u32.into())).collect(
    |                                            |
    |                                            required by a bound introduced by this call
    |
-   = note: multiple `impl`s satisfying `u32: From<_>` found in the following crates: `core`, `std`:
-           - impl From<Ipv4Addr> for u32;
-           - impl From<NonZeroU32> for u32;
-           - impl From<bool> for u32;
-           - impl From<char> for u32;
-           and 3 more
+   = note: cannot satisfy `u32: From<_>`
 help: try using a fully qualified path to specify the expected types
    |
 LL |     let ips: Vec<_> = (0..100_000).map(|_| u32::from(<u32 as Into<T>>::into(0u32))).collect();