resolve: Fix regression in resolution of raw keywords in paths

Author: petrochenkov

src/librustc_resolve/lib.rs

@@ -2183,11 +2183,8 @@ impl<'a> Resolver<'a> {
                                     Applicability::MaybeIncorrect,
                                 )),
                             )
-                        } else if !ident.is_reserved() {
-                            (format!("maybe a missing crate `{}`?", ident), None)
                         } else {
-                            // the parser will already have complained about the keyword being used
-                            return PathResult::NonModule(PartialRes::new(Res::Err));
+                            (format!("maybe a missing crate `{}`?", ident), None)
                         }
                     } else if i == 0 {
                         (format!("use of undeclared type or module `{}`", ident), None)

src/test/rustdoc-ui/issue-61732.rs

@@ -1,4 +1,4 @@
 // This previously triggered an ICE.
 
 pub(in crate::r#mod) fn main() {}
-//~^ ERROR expected module, found unresolved item
+//~^ ERROR failed to resolve: maybe a missing crate `r#mod`

src/test/rustdoc-ui/issue-61732.stderr

@@ -1,11 +1,11 @@
-error[E0577]: expected module, found unresolved item `crate::r#mod`
-  --> $DIR/issue-61732.rs:3:8
+error[E0433]: failed to resolve: maybe a missing crate `r#mod`?
+  --> $DIR/issue-61732.rs:3:15
    |
 LL | pub(in crate::r#mod) fn main() {}
-   |        ^^^^^^^^^^^^ not a module
+   |               ^^^^^ maybe a missing crate `r#mod`?
 
 error: Compilation failed, aborting rustdoc
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0577`.
+For more information about this error, try `rustc --explain E0433`.

src/test/ui/keyword/extern/keyword-extern-as-identifier-use.rs

@@ -1,3 +1,4 @@
 use extern::foo; //~ ERROR expected identifier, found keyword `extern`
+                 //~| ERROR unresolved import `r#extern`
 
 fn main() {}

src/test/ui/keyword/extern/keyword-extern-as-identifier-use.stderr

@@ -9,5 +9,12 @@ help: you can escape reserved keywords to use them as identifiers
 LL | use r#extern::foo;
    |     ^^^^^^^^
 
-error: aborting due to previous error
+error[E0432]: unresolved import `r#extern`
+  --> $DIR/keyword-extern-as-identifier-use.rs:1:5
+   |
+LL | use extern::foo;
+   |     ^^^^^^ maybe a missing crate `r#extern`?
+
+error: aborting due to 2 previous errors
 
+For more information about this error, try `rustc --explain E0432`.

src/test/ui/resolve/raw-ident-in-path.rs

@@ -0,0 +1,5 @@
+// Regression test for issue #63882.
+
+type A = crate::r#break; //~ ERROR cannot find type `r#break` in module `crate`
+
+fn main() {}

src/test/ui/resolve/raw-ident-in-path.stderr

@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `r#break` in module `crate`
+  --> $DIR/raw-ident-in-path.rs:3:17
+   |
+LL | type A = crate::r#break;
+   |                 ^^^^^^^ not found in `crate`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.