resolve, try_resolve_as_non_binding: use delay_span_bug due to parser recovery

src/librustc_resolve/late.rs

@@ -1536,20 +1536,18 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
         let is_syntactic_ambiguity = !has_sub && bm == BindingMode::ByValue(Mutability::Not);
 
         match res {
-            Res::Def(DefKind::Ctor(_, CtorKind::Const), _)
-            | Res::Def(DefKind::Const, _)
-            | Res::Def(DefKind::ConstParam, _)
-                if is_syntactic_ambiguity =>
-            {
+            Res::SelfCtor(_) // See #70549.
+            | Res::Def(
+                DefKind::Ctor(_, CtorKind::Const) | DefKind::Const | DefKind::ConstParam,
+                _,
+            ) if is_syntactic_ambiguity => {
                 // Disambiguate in favor of a unit struct/variant or constant pattern.
                 if let Some(binding) = binding {
                     self.r.record_use(ident, ValueNS, binding, false);
                 }
                 Some(res)
             }
-            Res::Def(DefKind::Ctor(..), _)
-            | Res::Def(DefKind::Const, _)
-            | Res::Def(DefKind::Static, _) => {
+            Res::Def(DefKind::Ctor(..) | DefKind::Const | DefKind::Static, _) => {
                 // This is unambiguously a fresh binding, either syntactically
                 // (e.g., `IDENT @ PAT` or `ref IDENT`) or because `IDENT` resolves
                 // to something unusable as a pattern (e.g., constructor function),
@@ -1572,7 +1570,7 @@ impl<'a, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
             _ => span_bug!(
                 ident.span,
                 "unexpected resolution for an identifier in pattern: {:?}",
-                res
+                res,
             ),
         }
     }

src/librustc_resolve/lib.rs

@@ -10,6 +10,7 @@
 #![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(nll)]
+#![feature(or_patterns)]
 #![recursion_limit = "256"]
 
 pub use rustc_hir::def::{Namespace, PerNS};

src/test/ui/parser/issue-70549-resolve-after-recovered-self-ctor.rs

@@ -0,0 +1,18 @@
+struct S {}
+
+impl S {
+    fn foo(&mur Self) {}
+    //~^ ERROR expected identifier, found keyword `Self`
+    //~| ERROR expected one of `:`, `@`
+    //~| ERROR the `Self` constructor can only be used with
+    fn bar(&'static mur Self) {}
+    //~^ ERROR unexpected lifetime
+    //~| ERROR expected identifier, found keyword `Self`
+    //~| ERROR expected one of `:`, `@`
+    //~| ERROR the `Self` constructor can only be used with
+
+    fn baz(&mur Self @ _) {}
+    //~^ ERROR expected one of `:`, `@`
+}
+
+fn main() {}

src/test/ui/parser/issue-70549-resolve-after-recovered-self-ctor.stderr

@@ -0,0 +1,56 @@
+error: expected identifier, found keyword `Self`
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:4:17
+   |
+LL |     fn foo(&mur Self) {}
+   |                 ^^^^ expected identifier, found keyword
+
+error: expected one of `:`, `@`, or `|`, found keyword `Self`
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:4:17
+   |
+LL |     fn foo(&mur Self) {}
+   |            -----^^^^
+   |            |    |
+   |            |    expected one of `:`, `@`, or `|`
+   |            help: declare the type after the parameter binding: `<identifier>: <type>`
+
+error: unexpected lifetime `'static` in pattern
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:8:13
+   |
+LL |     fn bar(&'static mur Self) {}
+   |             ^^^^^^^ help: remove the lifetime
+
+error: expected identifier, found keyword `Self`
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:8:25
+   |
+LL |     fn bar(&'static mur Self) {}
+   |                         ^^^^ expected identifier, found keyword
+
+error: expected one of `:`, `@`, or `|`, found keyword `Self`
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:8:25
+   |
+LL |     fn bar(&'static mur Self) {}
+   |            -------------^^^^
+   |            |            |
+   |            |            expected one of `:`, `@`, or `|`
+   |            help: declare the type after the parameter binding: `<identifier>: <type>`
+
+error: expected one of `:`, `@`, or `|`, found keyword `Self`
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:14:17
+   |
+LL |     fn baz(&mur Self @ _) {}
+   |                 ^^^^ expected one of `:`, `@`, or `|`
+
+error: the `Self` constructor can only be used with tuple or unit structs
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:4:17
+   |
+LL |     fn foo(&mur Self) {}
+   |                 ^^^^ help: use curly brackets: `Self { /* fields */ }`
+
+error: the `Self` constructor can only be used with tuple or unit structs
+  --> $DIR/issue-70549-resolve-after-recovered-self-ctor.rs:8:25
+   |
+LL |     fn bar(&'static mur Self) {}
+   |                         ^^^^ help: use curly brackets: `Self { /* fields */ }`
+
+error: aborting due to 8 previous errors
+