Auto merge of #42383 - estebank:candidate-newline, r=arielb1

Use multiline note for trait suggestion

src/librustc_typeck/check/method/suggest.rs

@@ -242,7 +242,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                     macro_rules! report_function {
                         ($span:expr, $name:expr) => {
                             err.note(&format!("{} is a function, perhaps you wish to call it",
-                                         $name));
+                                              $name));
                         }
                     }
 
@@ -329,9 +329,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             let mut candidates = valid_out_of_scope_traits;
             candidates.sort();
             candidates.dedup();
-            let msg = format!("items from traits can only be used if the trait is in scope; the \
+            err.help("items from traits can only be used if the trait is in scope");
-                               following {traits_are} implemented but not in scope, perhaps add \
+            let mut msg = format!("the following {traits_are} implemented but not in scope, \
-                               a `use` for {one_of_them}:",
+                                   perhaps add a `use` for {one_of_them}:",
                               traits_are = if candidates.len() == 1 {
                                   "trait is"
                               } else {
@@ -343,17 +343,17 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                                   "one of them"
                               });
 
-            err.help(&msg[..]);
-
             let limit = if candidates.len() == 5 { 5 } else { 4 };
             for (i, trait_did) in candidates.iter().take(limit).enumerate() {
-                err.help(&format!("candidate #{}: `use {};`",
+                msg.push_str(&format!("\ncandidate #{}: `use {};`",
-                                  i + 1,
+                                      i + 1,
-                                  self.tcx.item_path_str(*trait_did)));
+                                      self.tcx.item_path_str(*trait_did)));
             }
             if candidates.len() > limit {
-                err.note(&format!("and {} others", candidates.len() - limit));
+                msg.push_str(&format!("\nand {} others", candidates.len() - limit));
             }
+            err.note(&msg[..]);
+
             return;
         }
 
@@ -383,28 +383,27 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
             // FIXME #21673 this help message could be tuned to the case
             // of a type parameter: suggest adding a trait bound rather
             // than implementing.
-            let msg = format!("items from traits can only be used if the trait is implemented \
+            err.help("items from traits can only be used if the trait is implemented and in scope");
-                               and in scope; the following {traits_define} an item `{name}`, \
+            let mut msg = format!("the following {traits_define} an item `{name}`, \
-                               perhaps you need to implement {one_of_them}:",
+                                   perhaps you need to implement {one_of_them}:",
-                              traits_define = if candidates.len() == 1 {
+                                  traits_define = if candidates.len() == 1 {
-                                  "trait defines"
+                                      "trait defines"
-                              } else {
+                                  } else {
-                                  "traits define"
+                                      "traits define"
-                              },
+                                  },
-                              one_of_them = if candidates.len() == 1 {
+                                  one_of_them = if candidates.len() == 1 {
-                                  "it"
+                                      "it"
-                              } else {
+                                  } else {
-                                  "one of them"
+                                      "one of them"
-                              },
+                                  },
-                              name = item_name);
+                                  name = item_name);
-
-            err.help(&msg[..]);
 
             for (i, trait_info) in candidates.iter().enumerate() {
-                err.help(&format!("candidate #{}: `{}`",
+                msg.push_str(&format!("\ncandidate #{}: `{}`",
-                                  i + 1,
+                                      i + 1,
-                                  self.tcx.item_path_str(trait_info.def_id)));
+                                      self.tcx.item_path_str(trait_info.def_id)));
             }
+            err.note(&msg[..]);
         }
     }
 

src/test/compile-fail/method-call-err-msg.rs

@@ -33,5 +33,6 @@ fn main() {
     y.zero()
      .take()    //~ ERROR no method named `take` found for type `Foo` in the current scope
      //~^ NOTE the method `take` exists but the following trait bounds were not satisfied
+     //~| NOTE the following traits define an item `take`, perhaps you need to implement one of them
      .one(0);
 }

src/test/compile-fail/no-method-suggested-traits.rs

@@ -1,134 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// aux-build:no_method_suggested_traits.rs
-
-extern crate no_method_suggested_traits;
-
-struct Foo;
-enum Bar { X }
-
-mod foo {
-    pub trait Bar {
-        fn method(&self) {}
-
-        fn method2(&self) {}
-    }
-
-    impl Bar for u32 {}
-
-    impl Bar for char {}
-}
-
-fn main() {
-    // test the values themselves, and autoderef.
-
-
-    1u32.method();
-    //~^ HELP following traits are implemented but not in scope, perhaps add a `use` for one of them
-    //~^^ ERROR no method named
-    //~^^^ HELP `use foo::Bar;`
-    //~^^^^ HELP `use no_method_suggested_traits::foo::PubPub;`
-    std::rc::Rc::new(&mut Box::new(&1u32)).method();
-    //~^ HELP following traits are implemented but not in scope, perhaps add a `use` for one of them
-    //~^^ ERROR no method named
-    //~^^^ HELP `use foo::Bar;`
-    //~^^^^ HELP `use no_method_suggested_traits::foo::PubPub;`
-
-    'a'.method();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
-    //~^^^ HELP `use foo::Bar;`
-    std::rc::Rc::new(&mut Box::new(&'a')).method();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
-    //~^^^ HELP `use foo::Bar;`
-
-    1i32.method();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
-    //~^^^ HELP `use no_method_suggested_traits::foo::PubPub;`
-    std::rc::Rc::new(&mut Box::new(&1i32)).method();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
-    //~^^^ HELP `use no_method_suggested_traits::foo::PubPub;`
-
-    Foo.method();
-    //~^ ERROR no method named
-    //~^^ HELP following traits define an item `method`, perhaps you need to implement one of them
-    //~^^^ HELP `foo::Bar`
-    //~^^^^ HELP `no_method_suggested_traits::foo::PubPub`
-    //~^^^^^ HELP `no_method_suggested_traits::Reexported`
-    //~^^^^^^ HELP `no_method_suggested_traits::bar::PubPriv`
-    //~^^^^^^^ HELP `no_method_suggested_traits::qux::PrivPub`
-    //~^^^^^^^^ HELP `no_method_suggested_traits::quz::PrivPriv`
-    std::rc::Rc::new(&mut Box::new(&Foo)).method();
-    //~^ ERROR no method named
-    //~^^ HELP following traits define an item `method`, perhaps you need to implement one of them
-    //~^^^ HELP `foo::Bar`
-    //~^^^^ HELP `no_method_suggested_traits::foo::PubPub`
-    //~^^^^^ HELP `no_method_suggested_traits::Reexported`
-    //~^^^^^^ HELP `no_method_suggested_traits::bar::PubPriv`
-    //~^^^^^^^ HELP `no_method_suggested_traits::qux::PrivPub`
-    //~^^^^^^^^ HELP `no_method_suggested_traits::quz::PrivPriv`
-
-    1u64.method2();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-    std::rc::Rc::new(&mut Box::new(&1u64)).method2();
-    //~^ ERROR no method named
-    //~^^ HELP the following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-
-    no_method_suggested_traits::Foo.method2();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method2();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-    no_method_suggested_traits::Bar::X.method2();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method2();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method2`, perhaps you need to implement it
-    //~^^^ HELP `foo::Bar`
-
-    Foo.method3();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method3`, perhaps you need to implement it
-    //~^^^ HELP `no_method_suggested_traits::foo::PubPub`
-    std::rc::Rc::new(&mut Box::new(&Foo)).method3();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method3`, perhaps you need to implement it
-    //~^^^ HELP `no_method_suggested_traits::foo::PubPub`
-    Bar::X.method3();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method3`, perhaps you need to implement it
-    //~^^^ HELP `no_method_suggested_traits::foo::PubPub`
-    std::rc::Rc::new(&mut Box::new(&Bar::X)).method3();
-    //~^ ERROR no method named
-    //~^^ HELP following trait defines an item `method3`, perhaps you need to implement it
-    //~^^^ HELP `no_method_suggested_traits::foo::PubPub`
-
-    // should have no help:
-    1_usize.method3(); //~ ERROR no method named
-    std::rc::Rc::new(&mut Box::new(&1_usize)).method3(); //~ ERROR no method named
-    no_method_suggested_traits::Foo.method3();  //~ ERROR no method named
-    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method3();
-    //~^ ERROR no method named
-    no_method_suggested_traits::Bar::X.method3();  //~ ERROR no method named
-    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method3();
-    //~^ ERROR no method named
-}

src/test/ui/impl-trait/issue-21659-show-relevant-trait-impls-3.stderr

@@ -0,0 +1,12 @@
+error[E0599]: no method named `foo` found for type `Bar` in the current scope
+  --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:30:8
+   |
+30 |     f1.foo(1usize);
+   |        ^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `foo`, perhaps you need to implement it:
+           candidate #1: `Foo`
+
+error: aborting due to previous error(s)
+

src/test/ui/impl-trait/method-suggestion-no-duplication.stderr

@@ -0,0 +1,14 @@
+error[E0599]: no method named `is_empty` found for type `Foo` in the current scope
+  --> $DIR/method-suggestion-no-duplication.rs:19:15
+   |
+19 |     foo(|s| s.is_empty());
+   |               ^^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following traits define an item `is_empty`, perhaps you need to implement one of them:
+           candidate #1: `std::iter::ExactSizeIterator`
+           candidate #2: `core::slice::SliceExt`
+           candidate #3: `core::str::StrExt`
+
+error: aborting due to previous error(s)
+

src/test/ui/impl-trait/no-method-suggested-traits.rs

@@ -0,0 +1,133 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:no_method_suggested_traits.rs
+extern crate no_method_suggested_traits;
+
+struct Foo;
+enum Bar { X }
+
+mod foo {
+    pub trait Bar {
+        fn method(&self) {}
+
+        fn method2(&self) {}
+    }
+
+    impl Bar for u32 {}
+
+    impl Bar for char {}
+}
+
+fn main() {
+    // test the values themselves, and autoderef.
+
+
+    1u32.method();
+    //~^ HELP following traits are implemented but not in scope, perhaps add a `use` for one of them
+    //~| ERROR no method named
+    //~| HELP `use foo::Bar;`
+    //~| HELP `use no_method_suggested_traits::foo::PubPub;`
+    std::rc::Rc::new(&mut Box::new(&1u32)).method();
+    //~^ HELP following traits are implemented but not in scope, perhaps add a `use` for one of them
+    //~| ERROR no method named
+    //~| HELP `use foo::Bar;`
+    //~| HELP `use no_method_suggested_traits::foo::PubPub;`
+
+    'a'.method();
+    //~^ ERROR no method named
+    //~| HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
+    //~| HELP `use foo::Bar;`
+    std::rc::Rc::new(&mut Box::new(&'a')).method();
+    //~^ ERROR no method named
+    //~| HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
+    //~| HELP `use foo::Bar;`
+
+    1i32.method();
+    //~^ ERROR no method named
+    //~| HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
+    //~| HELP `use no_method_suggested_traits::foo::PubPub;`
+    std::rc::Rc::new(&mut Box::new(&1i32)).method();
+    //~^ ERROR no method named
+    //~| HELP the following trait is implemented but not in scope, perhaps add a `use` for it:
+    //~| HELP `use no_method_suggested_traits::foo::PubPub;`
+
+    Foo.method();
+    //~^ ERROR no method named
+    //~| HELP following traits define an item `method`, perhaps you need to implement one of them
+    //~| HELP `foo::Bar`
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+    //~| HELP `no_method_suggested_traits::Reexported`
+    //~| HELP `no_method_suggested_traits::bar::PubPriv`
+    //~| HELP `no_method_suggested_traits::qux::PrivPub`
+    //~| HELP `no_method_suggested_traits::quz::PrivPriv`
+    std::rc::Rc::new(&mut Box::new(&Foo)).method();
+    //~^ ERROR no method named
+    //~| HELP following traits define an item `method`, perhaps you need to implement one of them
+    //~| HELP `foo::Bar`
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+    //~| HELP `no_method_suggested_traits::Reexported`
+    //~| HELP `no_method_suggested_traits::bar::PubPriv`
+    //~| HELP `no_method_suggested_traits::qux::PrivPub`
+    //~| HELP `no_method_suggested_traits::quz::PrivPriv`
+
+    1u64.method2();
+    //~^ ERROR no method named
+    //~| HELP the following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+    std::rc::Rc::new(&mut Box::new(&1u64)).method2();
+    //~^ ERROR no method named
+    //~| HELP the following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+
+    no_method_suggested_traits::Foo.method2();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method2();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+    no_method_suggested_traits::Bar::X.method2();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method2();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method2`, perhaps you need to implement it
+    //~| HELP `foo::Bar`
+
+    Foo.method3();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method3`, perhaps you need to implement it
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+    std::rc::Rc::new(&mut Box::new(&Foo)).method3();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method3`, perhaps you need to implement it
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+    Bar::X.method3();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method3`, perhaps you need to implement it
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+    std::rc::Rc::new(&mut Box::new(&Bar::X)).method3();
+    //~^ ERROR no method named
+    //~| HELP following trait defines an item `method3`, perhaps you need to implement it
+    //~| HELP `no_method_suggested_traits::foo::PubPub`
+
+    // should have no help:
+    1_usize.method3(); //~ ERROR no method named
+    std::rc::Rc::new(&mut Box::new(&1_usize)).method3(); //~ ERROR no method named
+    no_method_suggested_traits::Foo.method3();  //~ ERROR no method named
+    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method3();
+    //~^ ERROR no method named
+    no_method_suggested_traits::Bar::X.method3();  //~ ERROR no method named
+    std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method3();
+    //~^ ERROR no method named
+}

src/test/ui/impl-trait/no-method-suggested-traits.stderr

@@ -0,0 +1,230 @@
+error[E0599]: no method named `method` found for type `u32` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:33:10
+   |
+33 |     1u32.method();
+   |          ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following traits are implemented but not in scope, perhaps add a `use` for one of them:
+           candidate #1: `use foo::Bar;`
+           candidate #2: `use no_method_suggested_traits::foo::PubPub;`
+
+error[E0599]: no method named `method` found for type `std::rc::Rc<&mut std::boxed::Box<&u32>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:38:44
+   |
+38 |     std::rc::Rc::new(&mut Box::new(&1u32)).method();
+   |                                            ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following traits are implemented but not in scope, perhaps add a `use` for one of them:
+           candidate #1: `use foo::Bar;`
+           candidate #2: `use no_method_suggested_traits::foo::PubPub;`
+
+error[E0599]: no method named `method` found for type `char` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:44:9
+   |
+44 |     'a'.method();
+   |         ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+           candidate #1: `use foo::Bar;`
+
+error[E0599]: no method named `method` found for type `std::rc::Rc<&mut std::boxed::Box<&char>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:48:43
+   |
+48 |     std::rc::Rc::new(&mut Box::new(&'a')).method();
+   |                                           ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+           candidate #1: `use foo::Bar;`
+
+error[E0599]: no method named `method` found for type `i32` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:53:10
+   |
+53 |     1i32.method();
+   |          ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+           candidate #1: `use no_method_suggested_traits::foo::PubPub;`
+
+error[E0599]: no method named `method` found for type `std::rc::Rc<&mut std::boxed::Box<&i32>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:57:44
+   |
+57 |     std::rc::Rc::new(&mut Box::new(&1i32)).method();
+   |                                            ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is in scope
+   = note: the following trait is implemented but not in scope, perhaps add a `use` for it:
+           candidate #1: `use no_method_suggested_traits::foo::PubPub;`
+
+error[E0599]: no method named `method` found for type `Foo` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:62:9
+   |
+62 |     Foo.method();
+   |         ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following traits define an item `method`, perhaps you need to implement one of them:
+           candidate #1: `foo::Bar`
+           candidate #2: `no_method_suggested_traits::foo::PubPub`
+           candidate #3: `no_method_suggested_traits::bar::PubPriv`
+           candidate #4: `no_method_suggested_traits::qux::PrivPub`
+           candidate #5: `no_method_suggested_traits::quz::PrivPriv`
+           candidate #6: `no_method_suggested_traits::Reexported`
+
+error[E0599]: no method named `method` found for type `std::rc::Rc<&mut std::boxed::Box<&Foo>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:71:43
+   |
+71 |     std::rc::Rc::new(&mut Box::new(&Foo)).method();
+   |                                           ^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following traits define an item `method`, perhaps you need to implement one of them:
+           candidate #1: `foo::Bar`
+           candidate #2: `no_method_suggested_traits::foo::PubPub`
+           candidate #3: `no_method_suggested_traits::bar::PubPriv`
+           candidate #4: `no_method_suggested_traits::qux::PrivPub`
+           candidate #5: `no_method_suggested_traits::quz::PrivPriv`
+           candidate #6: `no_method_suggested_traits::Reexported`
+
+error[E0599]: no method named `method2` found for type `u64` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:81:10
+   |
+81 |     1u64.method2();
+   |          ^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `method2`, perhaps you need to implement it:
+           candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method2` found for type `std::rc::Rc<&mut std::boxed::Box<&u64>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:85:44
+   |
+85 |     std::rc::Rc::new(&mut Box::new(&1u64)).method2();
+   |                                            ^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `method2`, perhaps you need to implement it:
+           candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method2` found for type `no_method_suggested_traits::Foo` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:90:37
+   |
+90 |     no_method_suggested_traits::Foo.method2();
+   |                                     ^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `method2`, perhaps you need to implement it:
+           candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method2` found for type `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Foo>>` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:94:71
+   |
+94 |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method2();
+   |                                                                       ^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `method2`, perhaps you need to implement it:
+           candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method2` found for type `no_method_suggested_traits::Bar` in the current scope
+  --> $DIR/no-method-suggested-traits.rs:98:40
+   |
+98 |     no_method_suggested_traits::Bar::X.method2();
+   |                                        ^^^^^^^
+   |
+   = help: items from traits can only be used if the trait is implemented and in scope
+   = note: the following trait defines an item `method2`, perhaps you need to implement it:
+           candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method2` found for type `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Bar>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:102:74
+    |
+102 |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method2();
+    |                                                                          ^^^^^^^
+    |
+    = help: items from traits can only be used if the trait is implemented and in scope
+    = note: the following trait defines an item `method2`, perhaps you need to implement it:
+            candidate #1: `foo::Bar`
+
+error[E0599]: no method named `method3` found for type `Foo` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:107:9
+    |
+107 |     Foo.method3();
+    |         ^^^^^^^
+    |
+    = help: items from traits can only be used if the trait is implemented and in scope
+    = note: the following trait defines an item `method3`, perhaps you need to implement it:
+            candidate #1: `no_method_suggested_traits::foo::PubPub`
+
+error[E0599]: no method named `method3` found for type `std::rc::Rc<&mut std::boxed::Box<&Foo>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:111:43
+    |
+111 |     std::rc::Rc::new(&mut Box::new(&Foo)).method3();
+    |                                           ^^^^^^^
+    |
+    = help: items from traits can only be used if the trait is implemented and in scope
+    = note: the following trait defines an item `method3`, perhaps you need to implement it:
+            candidate #1: `no_method_suggested_traits::foo::PubPub`
+
+error[E0599]: no method named `method3` found for type `Bar` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:115:12
+    |
+115 |     Bar::X.method3();
+    |            ^^^^^^^
+    |
+    = help: items from traits can only be used if the trait is implemented and in scope
+    = note: the following trait defines an item `method3`, perhaps you need to implement it:
+            candidate #1: `no_method_suggested_traits::foo::PubPub`
+
+error[E0599]: no method named `method3` found for type `std::rc::Rc<&mut std::boxed::Box<&Bar>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:119:46
+    |
+119 |     std::rc::Rc::new(&mut Box::new(&Bar::X)).method3();
+    |                                              ^^^^^^^
+    |
+    = help: items from traits can only be used if the trait is implemented and in scope
+    = note: the following trait defines an item `method3`, perhaps you need to implement it:
+            candidate #1: `no_method_suggested_traits::foo::PubPub`
+
+error[E0599]: no method named `method3` found for type `usize` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:125:13
+    |
+125 |     1_usize.method3(); //~ ERROR no method named
+    |             ^^^^^^^
+
+error[E0599]: no method named `method3` found for type `std::rc::Rc<&mut std::boxed::Box<&usize>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:126:47
+    |
+126 |     std::rc::Rc::new(&mut Box::new(&1_usize)).method3(); //~ ERROR no method named
+    |                                               ^^^^^^^
+
+error[E0599]: no method named `method3` found for type `no_method_suggested_traits::Foo` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:127:37
+    |
+127 |     no_method_suggested_traits::Foo.method3();  //~ ERROR no method named
+    |                                     ^^^^^^^
+
+error[E0599]: no method named `method3` found for type `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Foo>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:128:71
+    |
+128 |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method3();
+    |                                                                       ^^^^^^^
+
+error[E0599]: no method named `method3` found for type `no_method_suggested_traits::Bar` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:130:40
+    |
+130 |     no_method_suggested_traits::Bar::X.method3();  //~ ERROR no method named
+    |                                        ^^^^^^^
+
+error[E0599]: no method named `method3` found for type `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Bar>>` in the current scope
+   --> $DIR/no-method-suggested-traits.rs:131:74
+    |
+131 |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method3();
+    |                                                                          ^^^^^^^
+
+error: aborting due to previous error(s)
+

src/test/ui/span/issue-7575.stderr

@@ -23,10 +23,11 @@ note: candidate #3 is defined in the trait `UnusedTrait`
 29 |     fn f9(usize) -> usize; //~ NOTE candidate
    |     ^^^^^^^^^^^^^^^^^^^^^^
    = help: to disambiguate the method call, write `UnusedTrait::f9(u, 342)` instead
-   = help: items from traits can only be used if the trait is implemented and in scope; the following traits define an item `f9`, perhaps you need to implement one of them:
+   = help: items from traits can only be used if the trait is implemented and in scope
-   = help: candidate #1: `CtxtFn`
+   = note: the following traits define an item `f9`, perhaps you need to implement one of them:
-   = help: candidate #2: `OtherTrait`
+           candidate #1: `CtxtFn`
-   = help: candidate #3: `UnusedTrait`
+           candidate #2: `OtherTrait`
+           candidate #3: `UnusedTrait`
 
 error[E0599]: no method named `fff` found for type `Myisize` in the current scope
   --> $DIR/issue-7575.rs:74:30
@@ -58,8 +59,9 @@ note: candidate #1 is defined in the trait `ManyImplTrait`
 59 | |     }
    | |_____^
    = help: to disambiguate the method call, write `ManyImplTrait::is_str(t)` instead
-   = help: items from traits can only be used if the trait is implemented and in scope; the following trait defines an item `is_str`, perhaps you need to implement it:
+   = help: items from traits can only be used if the trait is implemented and in scope
-   = help: candidate #1: `ManyImplTrait`
+   = note: the following trait defines an item `is_str`, perhaps you need to implement it:
+           candidate #1: `ManyImplTrait`
 
 error: aborting due to previous error(s)