use the identifier span for missing struct field

src/librustc_typeck/check/_match.rs

@@ -971,7 +971,7 @@ https://doc.rust-lang.org/reference/types.html#trait-objects");
                             self.field_ty(span, f, substs)
                         })
                         .unwrap_or_else(|| {
-                            inexistent_fields.push((span, field.ident));
+                            inexistent_fields.push(field.ident);
                             no_field_errors = false;
                             tcx.types.err
                         })
@@ -987,15 +987,15 @@ https://doc.rust-lang.org/reference/types.html#trait-objects");
                 .collect::<Vec<_>>();
         if inexistent_fields.len() > 0 {
             let (field_names, t, plural) = if inexistent_fields.len() == 1 {
-                (format!("a field named `{}`", inexistent_fields[0].1), "this", "")
+                (format!("a field named `{}`", inexistent_fields[0]), "this", "")
             } else {
                 (format!("fields named {}",
                          inexistent_fields.iter()
-                            .map(|(_, name)| format!("`{}`", name))
+                            .map(|ident| format!("`{}`", ident))
                             .collect::<Vec<String>>()
                             .join(", ")), "these", "s")
             };
-            let spans = inexistent_fields.iter().map(|(span, _)| *span).collect::<Vec<_>>();
+            let spans = inexistent_fields.iter().map(|ident| ident.span).collect::<Vec<_>>();
             let mut err = struct_span_err!(tcx.sess,
                                            spans,
                                            E0026,
@@ -1003,8 +1003,8 @@ https://doc.rust-lang.org/reference/types.html#trait-objects");
                                            kind_name,
                                            tcx.item_path_str(variant.did),
                                            field_names);
-            if let Some((span, ident)) = inexistent_fields.last() {
-                err.span_label(*span,
+            if let Some(ident) = inexistent_fields.last() {
+                err.span_label(ident.span,
                                format!("{} `{}` does not have {} field{}",
                                        kind_name,
                                        tcx.item_path_str(variant.did),
@@ -1016,8 +1016,8 @@ https://doc.rust-lang.org/reference/types.html#trait-objects");
                         find_best_match_for_name(input, &ident.as_str(), None);
                     if let Some(suggested_name) = suggested_name {
                         err.span_suggestion(
-                            *span,
-                            "did you mean",
+                            ident.span,
+                            "a field with a similar name exists",
                             suggested_name.to_string(),
                             Applicability::MaybeIncorrect,
                         );

src/test/ui/issues/issue-17800.stderr

@@ -2,10 +2,10 @@ error[E0026]: variant `MyOption::MySome` does not have a field named `x`
   --> $DIR/issue-17800.rs:8:28
    |
 LL |         MyOption::MySome { x: 42 } => (),
-   |                            ^^^^^
+   |                            ^
    |                            |
    |                            variant `MyOption::MySome` does not have this field
-   |                            help: did you mean: `0`
+   |                            help: a field with a similar name exists: `0`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-51102.stderr

@@ -2,7 +2,7 @@ error[E0026]: struct `SimpleStruct` does not have a field named `state`
   --> $DIR/issue-51102.rs:13:17
    |
 LL |                 state: 0,
-   |                 ^^^^^^^^ struct `SimpleStruct` does not have this field
+   |                 ^^^^^ struct `SimpleStruct` does not have this field
 
 error[E0025]: field `no_state_here` bound multiple times in the pattern
   --> $DIR/issue-51102.rs:24:17
@@ -16,7 +16,7 @@ error[E0026]: variant `SimpleEnum::NoState` does not have a field named `state`
   --> $DIR/issue-51102.rs:33:17
    |
 LL |                 state: 0
-   |                 ^^^^^^^^ variant `SimpleEnum::NoState` does not have this field
+   |                 ^^^^^ variant `SimpleEnum::NoState` does not have this field
 
 error: aborting due to 3 previous errors
 

src/test/ui/issues/issue-52717.stderr

@@ -5,7 +5,7 @@ LL |     A::A { fob } => { println!("{}", fob); }
    |            ^^^
    |            |
    |            variant `A::A` does not have this field
-   |            help: did you mean: `foo`
+   |            help: a field with a similar name exists: `foo`
 
 error: aborting due to previous error
 

src/test/ui/numeric/numeric-fields.stderr

@@ -10,7 +10,7 @@ error[E0026]: struct `S` does not have a field named `0x1`
   --> $DIR/numeric-fields.rs:7:17
    |
 LL |         S{0: a, 0x1: b, ..} => {}
-   |                 ^^^^^^ struct `S` does not have this field
+   |                 ^^^ struct `S` does not have this field
 
 error: aborting due to 2 previous errors
 

src/test/ui/structs/struct-field-cfg.stderr

@@ -22,7 +22,7 @@ error[E0026]: struct `Foo` does not have a field named `absent`
   --> $DIR/struct-field-cfg.rs:16:42
    |
 LL |     let Foo { present: (), #[cfg(all())] absent: () } = foo;
-   |                                          ^^^^^^^^^^ struct `Foo` does not have this field
+   |                                          ^^^^^^ struct `Foo` does not have this field
 
 error: aborting due to 4 previous errors