On binding not present in all patterns, look at consts and unit structs/variants for suggestions

When encountering an or-pattern with a binding not available in all patterns, look for consts and unit struct/variants that have similar names as the binding to detect typos.

```
error[E0408]: variable `Ban` is not bound in all patterns
  --> $DIR/binding-typo.rs:22:9
   |
LL |         (Foo, _) | (Ban, Foo) => {}
   |         ^^^^^^^^    --- variable not in all patterns
   |         |
   |         pattern doesn't bind `Ban`
   |
help: you might have meant to use the similarly named unit variant `Bar`
   |
LL -         (Foo, _) | (Ban, Foo) => {}
LL +         (Foo, _) | (Bar, Foo) => {}
   |
```

For items that are not in the immedate scope, suggest the full path for them:

```
error[E0408]: variable `Non` is not bound in all patterns
  --> $DIR/binding-typo-2.rs:51:16
   |
LL |         (Non | Some(_))=> {}
   |          ---   ^^^^^^^ pattern doesn't bind `Non`
   |          |
   |          variable not in all patterns
   |
help: you might have meant to use the similarly named unit variant `None`
   |
LL -         (Non | Some(_))=> {}
LL +         (core::option::Option::None | Some(_))=> {}
   |
```

1 files changed, 111 insertions, 2 deletions

diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index 324310ff48b..beb882a325f 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -719,9 +719,85 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     );
 
                     if import_suggestions.is_empty() && !suggested_typo {
+                        let kinds = [
+                            DefKind::Ctor(CtorOf::Variant, CtorKind::Const),
+                            DefKind::Ctor(CtorOf::Struct, CtorKind::Const),
+                            DefKind::Const,
+                            DefKind::AssocConst,
+                        ];
+                        let mut local_names = vec![];
+                        self.add_module_candidates(
+                            parent_scope.module,
+                            &mut local_names,
+                            &|res| matches!(res, Res::Def(_, _)),
+                            None,
+                        );
+                        let local_names: FxHashSet<_> = local_names
+                            .into_iter()
+                            .filter_map(|s| match s.res {
+                                Res::Def(_, def_id) => Some(def_id),
+                                _ => None,
+                            })
+                            .collect();
+
+                        let mut local_suggestions = vec![];
+                        let mut suggestions = vec![];
+                        for kind in kinds {
+                            if let Some(suggestion) = self.early_lookup_typo_candidate(
+                                ScopeSet::All(Namespace::ValueNS),
+                                &parent_scope,
+                                name,
+                                &|res: Res| match res {
+                                    Res::Def(k, _) => k == kind,
+                                    _ => false,
+                                },
+                            ) && let Res::Def(kind, mut def_id) = suggestion.res
+                            {
+                                if let DefKind::Ctor(_, _) = kind {
+                                    def_id = self.tcx.parent(def_id);
+                                }
+                                let kind = kind.descr(def_id);
+                                if local_names.contains(&def_id) {
+                                    // The item is available in the current scope. Very likely to
+                                    // be a typo. Don't use the full path.
+                                    local_suggestions.push((
+                                        suggestion.candidate,
+                                        suggestion.candidate.to_string(),
+                                        kind,
+                                    ));
+                                } else {
+                                    suggestions.push((
+                                        suggestion.candidate,
+                                        self.def_path_str(def_id),
+                                        kind,
+                                    ));
+                                }
+                            }
+                        }
+                        let suggestions = if !local_suggestions.is_empty() {
+                            // There is at least one item available in the current scope that is a
+                            // likely typo. We only show those.
+                            local_suggestions
+                        } else {
+                            suggestions
+                        };
+                        for (name, sugg, kind) in suggestions {
+                            err.span_suggestion_verbose(
+                                span,
+                                format!(
+                                    "you might have meant to use the similarly named {kind} `{name}`",
+                                ),
+                                sugg,
+                                Applicability::MaybeIncorrect,
+                            );
+                            suggested_typo = true;
+                        }
+                    }
+                    if import_suggestions.is_empty() && !suggested_typo {
                         let help_msg = format!(
-                            "if you meant to match on a variant or a `const` item, consider \
-                             making the path in the pattern qualified: `path::to::ModOrType::{name}`",
+                            "if you meant to match on a unit struct, unit variant or a `const` \
+                             item, consider making the path in the pattern qualified: \
+                             `path::to::ModOrType::{name}`",
                         );
                         err.span_help(span, help_msg);
                     }
@@ -1041,6 +1117,39 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         .emit()
     }
 
+    fn def_path_str(&self, mut def_id: DefId) -> String {
+        // We can't use `def_path_str` in resolve.
+        let mut path = vec![def_id];
+        while let Some(parent) = self.tcx.opt_parent(def_id) {
+            def_id = parent;
+            path.push(def_id);
+            if def_id.is_top_level_module() {
+                break;
+            }
+        }
+        // We will only suggest importing directly if it is accessible through that path.
+        path.into_iter()
+            .rev()
+            .map(|def_id| {
+                self.tcx
+                    .opt_item_name(def_id)
+                    .map(|name| {
+                        match (
+                            def_id.is_top_level_module(),
+                            def_id.is_local(),
+                            self.tcx.sess.edition(),
+                        ) {
+                            (true, true, Edition::Edition2015) => String::new(),
+                            (true, true, _) => kw::Crate.to_string(),
+                            (true, false, _) | (false, _, _) => name.to_string(),
+                        }
+                    })
+                    .unwrap_or_else(|| "_".to_string())
+            })
+            .collect::<Vec<String>>()
+            .join("::")
+    }
+
     pub(crate) fn add_scope_set_candidates(
         &mut self,
         suggestions: &mut Vec<TypoSuggestion>,