Suggest assoc ty bound on lifetime in eq constraint

compiler/rustc_parse/src/errors.rs

@@ -2611,13 +2611,22 @@ pub(crate) struct GenericsInPath {
 }
 
 #[derive(Diagnostic)]
-#[diag(parse_assoc_lifetime)]
+#[diag(parse_lifetime_in_eq_constraint)]
 #[help]
-pub(crate) struct AssocLifetime {
+pub(crate) struct LifetimeInEqConstraint {
     #[primary_span]
-    pub span: Span,
     #[label]
-    pub lifetime: Span,
+    pub span: Span,
+    pub lifetime: Ident,
+    #[label(parse_context_label)]
+    pub binding_label: Span,
+    #[suggestion(
+        parse_colon_sugg,
+        style = "verbose",
+        applicability = "maybe-incorrect",
+        code = ": "
+    )]
+    pub colon_sugg: Span,
 }
 
 #[derive(Diagnostic)]