1 files changed, 34 insertions, 8 deletions
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 8046cc21c..f5a711315 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -39,7 +39,7 @@ use rustc_middle::ty::{self, print::Printer, subst::GenericArg, RegisteredTools,
 use rustc_session::lint::{BuiltinLintDiagnostics, LintExpectationId};
 use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintId};
 use rustc_session::Session;
-use rustc_span::lev_distance::find_best_match_for_name;
+use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_span::{BytePos, Span};
 use rustc_target::abi;
@@ -487,7 +487,7 @@ impl LintStore {
         let mut groups: Vec<_> = self
             .lint_groups
             .iter()
-            .filter_map(|(k, LintGroup { depr, .. })| if depr.is_none() { Some(k) } else { None })
+            .filter_map(|(k, LintGroup { depr, .. })| depr.is_none().then_some(k))
             .collect();
         groups.sort();
         let groups = groups.iter().map(|k| Symbol::intern(k));
@@ -837,9 +837,17 @@ pub trait LintContext: Sized {
                             (use_span, "'_".to_owned())
                         };
                         debug!(?deletion_span, ?use_span);
+
+                        // issue 107998 for the case such as a wrong function pointer type
+                        // `deletion_span` is empty and there is no need to report lifetime uses here
+                        let suggestions = if deletion_span.is_empty() {
+                            vec![(use_span, replace_lt)]
+                        } else {
+                            vec![(deletion_span, String::new()), (use_span, replace_lt)]
+                        };
                         db.multipart_suggestion(
                             msg,
-                            vec![(deletion_span, String::new()), (use_span, replace_lt)],
+                            suggestions,
                             Applicability::MachineApplicable,
                         );
                     }
@@ -882,6 +890,26 @@ pub trait LintContext: Sized {
                         );
                     }
                 }
+                BuiltinLintDiagnostics::ByteSliceInPackedStructWithDerive => {
+                    db.help("consider implementing the trait by hand, or remove the `packed` attribute");
+                }
+                BuiltinLintDiagnostics::UnusedExternCrate { removal_span }=> {
+                    db.span_suggestion(
+                        removal_span,
+                        "remove it",
+                        "",
+                        Applicability::MachineApplicable,
+                    );
+                }
+                BuiltinLintDiagnostics::ExternCrateNotIdiomatic { vis_span, ident_span }=> {
+                    let suggestion_span = vis_span.between(ident_span);
+                    db.span_suggestion_verbose(
+                        suggestion_span,
+                        "convert it to a `use`",
+                        if vis_span.is_empty() { "use " } else { " use " },
+                        Applicability::MachineApplicable,
+                    );
+                }
             }
             // Rewrap `db`, and pass control to the user.
             decorate(db)
@@ -1101,11 +1129,9 @@ impl<'tcx> LateContext<'tcx> {
                 .maybe_typeck_results()
                 .filter(|typeck_results| typeck_results.hir_owner == id.owner)
                 .or_else(|| {
-                    if self.tcx.has_typeck_results(id.owner.to_def_id()) {
-                        Some(self.tcx.typeck(id.owner.def_id))
-                    } else {
-                        None
-                    }
+                    self.tcx
+                        .has_typeck_results(id.owner.to_def_id())
+                        .then(|| self.tcx.typeck(id.owner.def_id))
                 })
                 .and_then(|typeck_results| typeck_results.type_dependent_def(id))
                 .map_or(Res::Err, |(kind, def_id)| Res::Def(kind, def_id)),