use structured suggestions for nonexistent fields

src/librustc_typeck/check/mod.rs

@@ -3415,8 +3415,12 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                         if let Some(suggested_field_name) =
                             Self::suggest_field_name(def.non_enum_variant(),
                                                      &field.as_str(), vec![]) {
-                                err.span_label(field.span,
+                                err.span_suggestion_with_applicability(
-                                               format!("did you mean `{}`?", suggested_field_name));
+                                    field.span,
+                                    "a field with a similar name exists",
+                                    suggested_field_name.to_string(),
+                                    Applicability::MaybeIncorrect,
+                                );
                             } else {
                                 err.span_label(field.span, "unknown field");
                                 let struct_variant_def = def.non_enum_variant();
@@ -3543,8 +3547,12 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
         if let Some(field_name) = Self::suggest_field_name(variant,
                                                            &field.ident.as_str(),
                                                            skip_fields.collect()) {
-            err.span_label(field.ident.span,
+            err.span_suggestion_with_applicability(
-                           format!("field does not exist - did you mean `{}`?", field_name));
+                    field.ident.span,
+                    "a field with a similar name exists",
+                    field_name.to_string(),
+                    Applicability::MaybeIncorrect,
+                );
         } else {
             match ty.sty {
                 ty::Adt(adt, ..) => {
@@ -5257,13 +5265,15 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                         if let Some(adt_def) = adt_def {
                             match adt_def.adt_kind() {
                                 AdtKind::Enum => {
-                                    err.note("did you mean to use one of the enum's variants?");
+                                    err.help("did you mean to use one of the enum's variants?");
                                 },
                                 AdtKind::Struct |
                                 AdtKind::Union => {
-                                    err.span_label(
+                                    err.span_suggestion_with_applicability(
                                         span,
-                                        format!("did you mean `Self {{ /* fields */ }}`?"),
+                                        "use curly brackets",
+                                        String::from("Self { /* fields */ }"),
+                                        Applicability::HasPlaceholders,
                                     );
                                 }
                             }

src/test/ui/did_you_mean/issue-36798.stderr

@@ -2,7 +2,7 @@ error[E0609]: no field `baz` on type `Foo`
   --> $DIR/issue-36798.rs:7:7
    |
 LL |     f.baz; //~ ERROR no field
-   |       ^^^ did you mean `bar`?
+   |       ^^^ help: a field with a similar name exists: `bar`
 
 error: aborting due to previous error
 

src/test/ui/did_you_mean/issue-42599_available_fields_note.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `submodule::Demo` has no field named `inocently_mispellable
   --> $DIR/issue-42599_available_fields_note.rs:16:39
    |
 LL |             Self { secret_integer: 2, inocently_mispellable: () }
-   |                                       ^^^^^^^^^^^^^^^^^^^^^ field does not exist - did you mean `innocently_misspellable`?
+   |                                       ^^^^^^^^^^^^^^^^^^^^^ help: a field with a similar name exists: `innocently_misspellable`
 
 error[E0560]: struct `submodule::Demo` has no field named `egregiously_nonexistent_field`
   --> $DIR/issue-42599_available_fields_note.rs:21:39
@@ -16,7 +16,7 @@ error[E0609]: no field `inocently_mispellable` on type `submodule::Demo`
   --> $DIR/issue-42599_available_fields_note.rs:32:41
    |
 LL |     let innocent_field_misaccess = demo.inocently_mispellable;
-   |                                         ^^^^^^^^^^^^^^^^^^^^^ did you mean `innocently_misspellable`?
+   |                                         ^^^^^^^^^^^^^^^^^^^^^ help: a field with a similar name exists: `innocently_misspellable`
 
 error[E0609]: no field `egregiously_nonexistent_field` on type `submodule::Demo`
   --> $DIR/issue-42599_available_fields_note.rs:35:42

src/test/ui/error-codes/ex-E0612.stderr

@@ -2,7 +2,7 @@ error[E0609]: no field `1` on type `Foo`
   --> $DIR/ex-E0612.rs:5:6
    |
 LL |    y.1; //~ ERROR no field `1` on type `Foo`
-   |      ^ did you mean `0`?
+   |      ^ help: a field with a similar name exists: `0`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-47073-zero-padded-tuple-struct-indices.stderr

@@ -2,7 +2,7 @@ error[E0609]: no field `00` on type `Verdict`
   --> $DIR/issue-47073-zero-padded-tuple-struct-indices.rs:8:30
    |
 LL |     let _condemned = justice.00;
-   |                              ^^ did you mean `0`?
+   |                              ^^ help: a field with a similar name exists: `0`
 
 error[E0609]: no field `001` on type `Verdict`
   --> $DIR/issue-47073-zero-padded-tuple-struct-indices.rs:10:31

src/test/ui/issues/issue-4736.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `NonCopyable` has no field named `p`
   --> $DIR/issue-4736.rs:4:26
    |
 LL |     let z = NonCopyable{ p: () }; //~ ERROR struct `NonCopyable` has no field named `p`
-   |                          ^ field does not exist - did you mean `0`?
+   |                          ^ help: a field with a similar name exists: `0`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-56199.stderr

@@ -4,7 +4,7 @@ error: the `Self` constructor can only be used with tuple or unit structs
 LL |         let _ = Self;
    |                 ^^^^
    |
-   = note: did you mean to use one of the enum's variants?
+   = help: did you mean to use one of the enum's variants?
 
 error: the `Self` constructor can only be used with tuple or unit structs
   --> $DIR/issue-56199.rs:8:17
@@ -12,19 +12,19 @@ error: the `Self` constructor can only be used with tuple or unit structs
 LL |         let _ = Self();
    |                 ^^^^
    |
-   = note: did you mean to use one of the enum's variants?
+   = help: did you mean to use one of the enum's variants?
 
 error: the `Self` constructor can only be used with tuple or unit structs
   --> $DIR/issue-56199.rs:15:17
    |
 LL |         let _ = Self;
-   |                 ^^^^ did you mean `Self { /* fields */ }`?
+   |                 ^^^^ help: use curly brackets: `Self { /* fields */ }`
 
 error: the `Self` constructor can only be used with tuple or unit structs
   --> $DIR/issue-56199.rs:17:17
    |
 LL |         let _ = Self();
-   |                 ^^^^ did you mean `Self { /* fields */ }`?
+   |                 ^^^^ help: use curly brackets: `Self { /* fields */ }`
 
 error: aborting due to 4 previous errors
 

src/test/ui/issues/issue-56835.stderr

@@ -2,7 +2,7 @@ error: the `Self` constructor can only be used with tuple or unit structs
   --> $DIR/issue-56835.rs:4:12
    |
 LL |     fn bar(Self(foo): Self) {}
-   |            ^^^^^^^^^ did you mean `Self { /* fields */ }`?
+   |            ^^^^^^^^^ help: use curly brackets: `Self { /* fields */ }`
 
 error[E0164]: expected tuple struct/variant, found self constructor `Self`
   --> $DIR/issue-56835.rs:4:12

src/test/ui/rmeta_meta_main.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `rmeta_meta::Foo` has no field named `field2`
   --> $DIR/rmeta_meta_main.rs:13:19
    |
 LL |     let _ = Foo { field2: 42 }; //~ ERROR struct `rmeta_meta::Foo` has no field named `field2`
-   |                   ^^^^^^ field does not exist - did you mean `field`?
+   |                   ^^^^^^ help: a field with a similar name exists: `field`
 
 error: aborting due to previous error
 

src/test/ui/structs/struct-fields-hints-no-dupe.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `A` has no field named `bar`
   --> $DIR/struct-fields-hints-no-dupe.rs:10:9
    |
 LL |         bar : 42,
-   |         ^^^ field does not exist - did you mean `barr`?
+   |         ^^^ help: a field with a similar name exists: `barr`
 
 error: aborting due to previous error
 

src/test/ui/structs/struct-fields-hints.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `A` has no field named `bar`
   --> $DIR/struct-fields-hints.rs:10:9
    |
 LL |         bar : 42,
-   |         ^^^ field does not exist - did you mean `car`?
+   |         ^^^ help: a field with a similar name exists: `car`
 
 error: aborting due to previous error
 

src/test/ui/structs/struct-fields-typo.rs

@@ -8,7 +8,8 @@ fn main() {
         foo: 0,
         bar: 0.5,
     };
-    let x = foo.baa;//~ no field `baa` on type `BuildData`
+    let x = foo.baa; //~ ERROR no field `baa` on type `BuildData`
-    //~^ did you mean `bar`?
+                     //~| HELP a field with a similar name exists
+                     //~| SUGGESTION bar
     println!("{}", x);
 }

src/test/ui/structs/struct-fields-typo.stderr

@@ -1,8 +1,8 @@
 error[E0609]: no field `baa` on type `BuildData`
   --> $DIR/struct-fields-typo.rs:11:17
    |
-LL |     let x = foo.baa;//~ no field `baa` on type `BuildData`
+LL |     let x = foo.baa; //~ ERROR no field `baa` on type `BuildData`
-   |                 ^^^ did you mean `bar`?
+   |                 ^^^ help: a field with a similar name exists: `bar`
 
 error: aborting due to previous error
 

src/test/ui/suggestions/suggest-private-fields.stderr

@@ -2,7 +2,7 @@ error[E0560]: struct `xc::B` has no field named `aa`
   --> $DIR/suggest-private-fields.rs:15:9
    |
 LL |         aa: 20,
-   |         ^^ field does not exist - did you mean `a`?
+   |         ^^ help: a field with a similar name exists: `a`
 
 error[E0560]: struct `xc::B` has no field named `bb`
   --> $DIR/suggest-private-fields.rs:17:9
@@ -16,13 +16,13 @@ error[E0560]: struct `A` has no field named `aa`
   --> $DIR/suggest-private-fields.rs:22:9
    |
 LL |         aa: 20,
-   |         ^^ field does not exist - did you mean `a`?
+   |         ^^ help: a field with a similar name exists: `a`
 
 error[E0560]: struct `A` has no field named `bb`
   --> $DIR/suggest-private-fields.rs:24:9
    |
 LL |         bb: 20,
-   |         ^^ field does not exist - did you mean `b`?
+   |         ^^ help: a field with a similar name exists: `b`
 
 error: aborting due to 4 previous errors
 

src/test/ui/tuple/tuple-index-not-tuple.stderr

@@ -2,7 +2,7 @@ error[E0609]: no field `0` on type `Point`
   --> $DIR/tuple-index-not-tuple.rs:6:12
    |
 LL |     origin.0;
-   |            ^ did you mean `x`?
+   |            ^ help: a field with a similar name exists: `x`
 
 error[E0609]: no field `0` on type `Empty`
   --> $DIR/tuple-index-not-tuple.rs:8:11

src/test/ui/tuple/tuple-index-out-of-bounds.stderr

@@ -2,7 +2,7 @@ error[E0609]: no field `2` on type `Point`
   --> $DIR/tuple-index-out-of-bounds.rs:7:12
    |
 LL |     origin.2;
-   |            ^ did you mean `0`?
+   |            ^ help: a field with a similar name exists: `0`
 
 error[E0609]: no field `2` on type `({integer}, {integer})`
   --> $DIR/tuple-index-out-of-bounds.rs:12:11

src/test/ui/union/union-suggest-field.rs

@@ -9,8 +9,12 @@ impl U {
 fn main() {
     let u = U { principle: 0 };
     //~^ ERROR union `U` has no field named `principle`
+    //~| HELP a field with a similar name exists
+    //~| SUGGESTION principal
     let w = u.principial; //~ ERROR no field `principial` on type `U`
-                          //~^ did you mean `principal`?
+                          //~| HELP a field with a similar name exists
+                          //~| SUGGESTION principal
 
     let y = u.calculate; //~ ERROR attempted to take value of method `calculate` on type `U`
+                         //~| HELP maybe a `()` to call it is missing
 }

src/test/ui/union/union-suggest-field.stderr

@@ -2,16 +2,16 @@ error[E0560]: union `U` has no field named `principle`
   --> $DIR/union-suggest-field.rs:10:17
    |
 LL |     let u = U { principle: 0 };
-   |                 ^^^^^^^^^ field does not exist - did you mean `principal`?
+   |                 ^^^^^^^^^ help: a field with a similar name exists: `principal`
 
 error[E0609]: no field `principial` on type `U`
-  --> $DIR/union-suggest-field.rs:12:15
+  --> $DIR/union-suggest-field.rs:14:15
    |
 LL |     let w = u.principial; //~ ERROR no field `principial` on type `U`
-   |               ^^^^^^^^^^ did you mean `principal`?
+   |               ^^^^^^^^^^ help: a field with a similar name exists: `principal`
 
 error[E0615]: attempted to take value of method `calculate` on type `U`
-  --> $DIR/union-suggest-field.rs:15:15
+  --> $DIR/union-suggest-field.rs:18:15
    |
 LL |     let y = u.calculate; //~ ERROR attempted to take value of method `calculate` on type `U`
    |               ^^^^^^^^^