Add `on_unimplemented" typo suggestions

compiler/rustc_lint/src/context/diagnostics.rs

@@ -347,5 +347,13 @@ pub(super) fn builtin(sess: &Session, diagnostic: BuiltinLintDiag, diag: &mut Di
                 "reduce the glob import's visibility or increase visibility of imported items",
             );
         }
+        BuiltinLintDiag::MaybeTypo { span, name } => {
+            diag.span_suggestion_verbose(
+                span,
+                "an attribute with a similar name exists",
+                name,
+                Applicability::MachineApplicable,
+            );
+        }
     }
 }

compiler/rustc_lint_defs/src/lib.rs

@@ -663,6 +663,10 @@ pub enum BuiltinLintDiag {
         span: Span,
         max_vis: String,
     },
+    MaybeTypo {
+        span: Span,
+        name: Symbol,
+    },
 }
 
 /// Lints that are buffered up early on in the `Session` before the

compiler/rustc_resolve/src/macros.rs

@@ -29,6 +29,7 @@ use rustc_session::lint::builtin::{LEGACY_DERIVE_HELPERS, SOFT_UNSTABLE};
 use rustc_session::lint::builtin::{UNUSED_MACROS, UNUSED_MACRO_RULES};
 use rustc_session::lint::BuiltinLintDiag;
 use rustc_session::parse::feature_err;
+use rustc_span::edit_distance::edit_distance;
 use rustc_span::edition::Edition;
 use rustc_span::hygiene::{self, ExpnData, ExpnKind, LocalExpnId};
 use rustc_span::hygiene::{AstPass, MacroKind};
@@ -568,15 +569,24 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         }
 
         if res == Res::NonMacroAttr(NonMacroAttrKind::Tool)
-            && path.segments.len() >= 2
+            && let [namespace, attribute, ..] = &*path.segments
-            && path.segments[0].ident.name == sym::diagnostic
+            && namespace.ident.name == sym::diagnostic
-            && path.segments[1].ident.name != sym::on_unimplemented
+            && attribute.ident.name != sym::on_unimplemented
         {
-            self.tcx.sess.psess.buffer_lint(
+            let distance =
+                edit_distance(attribute.ident.name.as_str(), sym::on_unimplemented.as_str(), 5);
+
+            let help = if distance.is_some() {
+                BuiltinLintDiag::MaybeTypo { span: attribute.span(), name: sym::on_unimplemented }
+            } else {
+                BuiltinLintDiag::Normal
+            };
+            self.tcx.sess.psess.buffer_lint_with_diagnostic(
                 UNKNOWN_OR_MALFORMED_DIAGNOSTIC_ATTRIBUTES,
-                path.segments[1].span(),
+                attribute.span(),
                 node_id,
                 "unknown diagnostic attribute",
+                help,
             );
         }
 

tests/ui/diagnostic_namespace/suggest_typos.rs

@@ -0,0 +1,18 @@
+#![deny(unknown_or_malformed_diagnostic_attributes)]
+
+#[diagnostic::onunimplemented]
+//~^ERROR unknown diagnostic attribute
+//~^^HELP an attribute with a similar name exists
+trait X{}
+
+#[diagnostic::un_onimplemented]
+//~^ERROR unknown diagnostic attribute
+//~^^HELP an attribute with a similar name exists
+trait Y{}
+
+#[diagnostic::on_implemented]
+//~^ERROR unknown diagnostic attribute
+//~^^HELP an attribute with a similar name exists
+trait Z{}
+
+fn main(){}

tests/ui/diagnostic_namespace/suggest_typos.stderr

@@ -0,0 +1,40 @@
+error: unknown diagnostic attribute
+  --> $DIR/suggest_typos.rs:3:15
+   |
+LL | #[diagnostic::onunimplemented]
+   |               ^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/suggest_typos.rs:1:9
+   |
+LL | #![deny(unknown_or_malformed_diagnostic_attributes)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: an attribute with a similar name exists
+   |
+LL | #[diagnostic::on_unimplemented]
+   |               ~~~~~~~~~~~~~~~~
+
+error: unknown diagnostic attribute
+  --> $DIR/suggest_typos.rs:8:15
+   |
+LL | #[diagnostic::un_onimplemented]
+   |               ^^^^^^^^^^^^^^^^
+   |
+help: an attribute with a similar name exists
+   |
+LL | #[diagnostic::on_unimplemented]
+   |               ~~~~~~~~~~~~~~~~
+
+error: unknown diagnostic attribute
+  --> $DIR/suggest_typos.rs:13:15
+   |
+LL | #[diagnostic::on_implemented]
+   |               ^^^^^^^^^^^^^^
+   |
+help: an attribute with a similar name exists
+   |
+LL | #[diagnostic::on_unimplemented]
+   |               ~~~~~~~~~~~~~~~~
+
+error: aborting due to 3 previous errors
+