keep predicate order and tweak output

estebank · estebank · commit a66599f3a0d6 · 2020-02-24T18:55:51.000-08:00
diff --git a/src/librustc_typeck/check/method/suggest.rs b/src/librustc_typeck/check/method/suggest.rs
@@ -644,7 +644,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                 },
                             })
                         })
-                        .collect::<Vec<String>>();
+                        .enumerate()
+                        .collect::<Vec<(usize, String)>>();
                     for ((span, empty_where), obligations) in type_params.into_iter() {
                         err.span_suggestion_verbose(
                             span,
@@ -662,15 +663,20 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         );
                     }
 
-                    bound_list.sort();
-                    bound_list.dedup(); // #35677
+                    bound_list.sort_by(|(_, a), (_, b)| a.cmp(&b)); // Sort alphabetically.
+                    bound_list.dedup_by(|(_, a), (_, b)| a == b); // #35677
+                    bound_list.sort_by_key(|(pos, _)| *pos); // Keep the original predicate order.
                     bound_spans.sort();
                     bound_spans.dedup();
                     for (span, msg) in bound_spans.into_iter() {
                         err.span_label(span, &msg);
                     }
                     if !bound_list.is_empty() {
-                        let bound_list = bound_list.join("\n");
+                        let bound_list = bound_list
+                            .into_iter()
+                            .map(|(_, path)| path)
+                            .collect::<Vec<_>>()
+                            .join("\n");
                         err.note(&format!(
                             "the method `{}` exists but the following trait bounds were not \
                              satisfied:\n{}",
@@ -1095,7 +1101,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let mut use_note = true;
                 if let [trait_info] = &candidates[..] {
                     if let Some(span) = self.tcx.hir().span_if_local(trait_info.def_id) {
-                        err.span_label(
+                        err.span_note(
                             self.tcx.sess.source_map().def_span(span),
                             &format!(
                                 "`{}` defines an item `{}`, perhaps you need to {} it",
diff --git a/src/test/ui/associated-const/associated-const-no-item.stderr b/src/test/ui/associated-const/associated-const-no-item.stderr
@@ -1,13 +1,15 @@
 error[E0599]: no associated item named `ID` found for type `i32` in the current scope
   --> $DIR/associated-const-no-item.rs:5:23
    |
-LL | trait Foo {
-   | --------- `Foo` defines an item `ID`, perhaps you need to implement it
-...
 LL | const X: i32 = <i32>::ID;
    |                       ^^ associated item not found in `i32`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `Foo` defines an item `ID`, perhaps you need to implement it
+  --> $DIR/associated-const-no-item.rs:1:1
+   |
+LL | trait Foo {
+   | ^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/auto-ref-slice-plus-ref.stderr b/src/test/ui/auto-ref-slice-plus-ref.stderr
@@ -3,44 +3,52 @@ error[E0599]: no method named `test_mut` found for struct `std::vec::Vec<{intege
    |
 LL |     a.test_mut();
    |       ^^^^^^^^ help: there is a method with a similar name: `get_mut`
-...
-LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test_mut`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `MyIter` defines an item `test_mut`, perhaps you need to implement it
+  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+   |
+LL | trait MyIter {
+   | ^^^^^^^^^^^^
 
 error[E0599]: no method named `test` found for struct `std::vec::Vec<{integer}>` in the current scope
   --> $DIR/auto-ref-slice-plus-ref.rs:8:7
    |
 LL |     a.test();
    |       ^^^^ method not found in `std::vec::Vec<{integer}>`
-...
-LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `MyIter` defines an item `test`, perhaps you need to implement it
+  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+   |
+LL | trait MyIter {
+   | ^^^^^^^^^^^^
 
 error[E0599]: no method named `test` found for array `[{integer}; 1]` in the current scope
   --> $DIR/auto-ref-slice-plus-ref.rs:10:11
    |
 LL |     ([1]).test();
    |           ^^^^ method not found in `[{integer}; 1]`
-...
-LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `MyIter` defines an item `test`, perhaps you need to implement it
+  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+   |
+LL | trait MyIter {
+   | ^^^^^^^^^^^^
 
 error[E0599]: no method named `test` found for reference `&[{integer}; 1]` in the current scope
   --> $DIR/auto-ref-slice-plus-ref.rs:11:12
    |
 LL |     (&[1]).test();
    |            ^^^^ method not found in `&[{integer}; 1]`
-...
-LL | trait MyIter {
-   | ------------ `MyIter` defines an item `test`, perhaps you need to implement it
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `MyIter` defines an item `test`, perhaps you need to implement it
+  --> $DIR/auto-ref-slice-plus-ref.rs:14:1
+   |
+LL | trait MyIter {
+   | ^^^^^^^^^^^^
 
 error: aborting due to 4 previous errors
 
diff --git a/src/test/ui/impl-trait/issues/issue-21659-show-relevant-trait-impls-3.stderr b/src/test/ui/impl-trait/issues/issue-21659-show-relevant-trait-impls-3.stderr
@@ -1,16 +1,18 @@
 error[E0599]: no method named `foo` found for struct `Bar` in the current scope
   --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:20:8
    |
-LL | trait Foo<A> {
-   | ------------ `Foo` defines an item `foo`, perhaps you need to implement it
-...
 LL | struct Bar;
    | ----------- method `foo` not found for this
 ...
 LL |     f1.foo(1usize);
    |        ^^^ method not found in `Bar`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `Foo` defines an item `foo`, perhaps you need to implement it
+  --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:1:1
+   |
+LL | trait Foo<A> {
+   | ^^^^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/impl-trait/no-method-suggested-traits.stderr b/src/test/ui/impl-trait/no-method-suggested-traits.stderr
@@ -122,68 +122,80 @@ LL |     std::rc::Rc::new(&mut Box::new(&Foo)).method();
 error[E0599]: no method named `method2` found for type `u64` in the current scope
   --> $DIR/no-method-suggested-traits.rs:45:10
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     1u64.method2();
    |          ^^^^^^^ method not found in `u64`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::boxed::Box<&u64>>` in the current scope
   --> $DIR/no-method-suggested-traits.rs:47:44
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     std::rc::Rc::new(&mut Box::new(&1u64)).method2();
    |                                            ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&u64>>`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method2` found for struct `no_method_suggested_traits::Foo` in the current scope
   --> $DIR/no-method-suggested-traits.rs:50:37
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     no_method_suggested_traits::Foo.method2();
    |                                     ^^^^^^^ method not found in `no_method_suggested_traits::Foo`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Foo>>` in the current scope
   --> $DIR/no-method-suggested-traits.rs:52:71
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Foo)).method2();
    |                                                                       ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Foo>>`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method2` found for enum `no_method_suggested_traits::Bar` in the current scope
   --> $DIR/no-method-suggested-traits.rs:54:40
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     no_method_suggested_traits::Bar::X.method2();
    |                                        ^^^^^^^ method not found in `no_method_suggested_traits::Bar`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method2` found for struct `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Bar>>` in the current scope
   --> $DIR/no-method-suggested-traits.rs:56:74
    |
-LL |     pub trait Bar {
-   |     ------------- `foo::Bar` defines an item `method2`, perhaps you need to implement it
-...
 LL |     std::rc::Rc::new(&mut Box::new(&no_method_suggested_traits::Bar::X)).method2();
    |                                                                          ^^^^^^^ method not found in `std::rc::Rc<&mut std::boxed::Box<&no_method_suggested_traits::Bar>>`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `foo::Bar` defines an item `method2`, perhaps you need to implement it
+  --> $DIR/no-method-suggested-traits.rs:8:5
+   |
+LL |     pub trait Bar {
+   |     ^^^^^^^^^^^^^
 
 error[E0599]: no method named `method3` found for struct `Foo` in the current scope
   --> $DIR/no-method-suggested-traits.rs:59:9
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &Some(42).as_deref();
    |                             ^^^^^^^^ help: there is a method with a similar name: `as_ref`
    |
    = note: the method `as_deref` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::Deref`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref_mut.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref_mut.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &mut Some(42).as_deref_mut();
    |                                 ^^^^^^^^^^^^ method not found in `std::option::Option<{integer}>`
    |
    = note: the method `as_deref_mut` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::DerefMut`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &Ok(42).as_deref();
    |                           ^^^^^^^^ help: there is a method with a similar name: `as_ref`
    |
    = note: the method `as_deref` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::Deref`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_err.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_err.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &Err(41).as_deref_err();
    |                            ^^^^^^^^^^^^ help: there is a method with a similar name: `as_deref_mut`
    |
    = note: the method `as_deref_err` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::Deref`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &mut Ok(42).as_deref_mut();
    |                               ^^^^^^^^^^^^ help: there is a method with a similar name: `as_deref_err`
    |
    = note: the method `as_deref_mut` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::DerefMut`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut_err.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut_err.stderr
@@ -5,8 +5,8 @@ LL |     let _result = &mut Err(41).as_deref_mut_err();
    |                                ^^^^^^^^^^^^^^^^ help: there is a method with a similar name: `as_deref_mut`
    |
    = note: the method `as_deref_mut_err` exists but the following trait bounds were not satisfied:
-           `<{integer} as std::ops::Deref>::Target = _`
            `{integer}: std::ops::DerefMut`
+           `<{integer} as std::ops::Deref>::Target = _`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-57362-1.stderr b/src/test/ui/issues/issue-57362-1.stderr
@@ -1,14 +1,16 @@
 error[E0599]: no method named `f` found for fn pointer `fn(&u8)` in the current scope
   --> $DIR/issue-57362-1.rs:20:7
    |
-LL | trait Trait {
-   | ----------- `Trait` defines an item `f`, perhaps you need to implement it
-...
 LL |     a.f();
    |       ^ method not found in `fn(&u8)`
    |
    = note: `a` is a function, perhaps you wish to call it
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `Trait` defines an item `f`, perhaps you need to implement it
+  --> $DIR/issue-57362-1.rs:8:1
+   |
+LL | trait Trait {
+   | ^^^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-57362-2.stderr b/src/test/ui/issues/issue-57362-2.stderr
@@ -1,13 +1,15 @@
 error[E0599]: no function or associated item named `make_g` found for fn pointer `for<'r> fn(&'r ())` in the current scope
   --> $DIR/issue-57362-2.rs:22:25
    |
-LL | trait X {
-   | ------- `X` defines an item `make_g`, perhaps you need to implement it
-...
 LL |     let x = <fn (&())>::make_g();
    |                         ^^^^^^ function or associated item not found in `for<'r> fn(&'r ())`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `X` defines an item `make_g`, perhaps you need to implement it
+  --> $DIR/issue-57362-2.rs:8:1
+   |
+LL | trait X {
+   | ^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/never_type/issue-2149.stderr b/src/test/ui/never_type/issue-2149.stderr
@@ -9,13 +9,15 @@ LL |         for elt in self { r = r + f(*elt); }
 error[E0599]: no method named `bind` found for array `[&str; 1]` in the current scope
   --> $DIR/issue-2149.rs:13:12
    |
-LL | trait VecMonad<A> {
-   | ----------------- `VecMonad` defines an item `bind`, perhaps you need to implement it
-...
 LL |     ["hi"].bind(|x| [x] );
    |            ^^^^ method not found in `[&str; 1]`
    |
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `VecMonad` defines an item `bind`, perhaps you need to implement it
+  --> $DIR/issue-2149.rs:1:1
+   |
+LL | trait VecMonad<A> {
+   | ^^^^^^^^^^^^^^^^^
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr b/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr
@@ -1,9 +1,6 @@
 error[E0599]: no method named `foo_one` found for struct `MyStruct` in the current scope
   --> $DIR/specialization-trait-not-implemented.rs:22:29
    |
-LL | trait Foo {
-   | --------- `Foo` defines an item `foo_one`, perhaps you need to implement it
-...
 LL | struct MyStruct;
    | ----------------
    | |
@@ -16,6 +13,11 @@ LL |     println!("{}", MyStruct.foo_one());
    = note: the method `foo_one` exists but the following trait bounds were not satisfied:
            `MyStruct: Foo`
    = help: items from traits can only be used if the trait is implemented and in scope
+note: `Foo` defines an item `foo_one`, perhaps you need to implement it
+  --> $DIR/specialization-trait-not-implemented.rs:7:1
+   |
+LL | trait Foo {
+   | ^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/suggestions/missing-trait-bounds-for-method-call.stderr b/src/test/ui/suggestions/missing-trait-bounds-for-method-call.stderr
diff --git a/src/test/ui/traits/trait-item-privacy.stderr b/src/test/ui/traits/trait-item-privacy.stderr
diff --git a/src/test/ui/trivial-bounds/trivial-bounds-leak.stderr b/src/test/ui/trivial-bounds/trivial-bounds-leak.stderr
diff --git a/src/test/ui/unique-object-noncopyable.stderr b/src/test/ui/unique-object-noncopyable.stderr

Original file line number	Diff line number	Diff line change
`@@ -5,8 +5,8 @@ LL \| let _result = &Some(42).as_deref();`
`5`	`5`	\| ^^^^^^^^ help: there is a method with a similar name: `as_ref`
`6`	`6`	`\|`
`7`	`7`	= note: the method `as_deref` exists but the following trait bounds were not satisfied:
`8`		- `<{integer} as std::ops::Deref>::Target = _`
`9`	`8`	`{integer}: std::ops::Deref`
	`9`	+ `<{integer} as std::ops::Deref>::Target = _`
`10`	`10`
`11`	`11`	`error: aborting due to previous error`
`12`	`12`
Original file line number	Diff line number	Diff line change
`@@ -5,8 +5,8 @@ LL \| let _result = &mut Some(42).as_deref_mut();`
`5`	`5`	\| ^^^^^^^^^^^^ method not found in `std::option::Option<{integer}>`
`6`	`6`	`\|`
`7`	`7`	= note: the method `as_deref_mut` exists but the following trait bounds were not satisfied:
`8`		- `<{integer} as std::ops::Deref>::Target = _`
`9`	`8`	`{integer}: std::ops::DerefMut`
	`9`	+ `<{integer} as std::ops::Deref>::Target = _`
`10`	`10`
`11`	`11`	`error: aborting due to previous error`
`12`	`12`
Original file line number	Diff line number	Diff line change
`@@ -5,8 +5,8 @@ LL \| let _result = &Ok(42).as_deref();`
`5`	`5`	\| ^^^^^^^^ help: there is a method with a similar name: `as_ref`
`6`	`6`	`\|`
`7`	`7`	= note: the method `as_deref` exists but the following trait bounds were not satisfied:
`8`		- `<{integer} as std::ops::Deref>::Target = _`
`9`	`8`	`{integer}: std::ops::Deref`
	`9`	+ `<{integer} as std::ops::Deref>::Target = _`
`10`	`10`
`11`	`11`	`error: aborting due to previous error`
`12`	`12`
Original file line number	Diff line number	Diff line change
`@@ -5,8 +5,8 @@ LL \| let _result = &Err(41).as_deref_err();`
`5`	`5`	\| ^^^^^^^^^^^^ help: there is a method with a similar name: `as_deref_mut`
`6`	`6`	`\|`
`7`	`7`	= note: the method `as_deref_err` exists but the following trait bounds were not satisfied:
`8`		- `<{integer} as std::ops::Deref>::Target = _`
`9`	`8`	`{integer}: std::ops::Deref`
	`9`	+ `<{integer} as std::ops::Deref>::Target = _`
`10`	`10`
`11`	`11`	`error: aborting due to previous error`
`12`	`12`