Fix CrateLocationUnknownType error

Author: YC

compiler/rustc_metadata/src/errors.rs

@@ -692,6 +692,7 @@ pub struct CrateLocationUnknownType<'a> {
     #[primary_span]
     pub span: Span,
     pub path: &'a Path,
+    pub crate_name: Symbol,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_metadata/src/locator.rs

@@ -1024,7 +1024,7 @@ impl CrateError {
                 if !locator.crate_rejections.via_filename.is_empty() {
                     let mismatches = locator.crate_rejections.via_filename.iter();
                     for CrateMismatch { path, .. } in mismatches {
-                        sess.emit_err(CrateLocationUnknownType { span, path: &path });
+                        sess.emit_err(CrateLocationUnknownType { span, path: &path, crate_name });
                         sess.emit_err(LibFilenameForm {
                             span,
                             dll_prefix: &locator.dll_prefix,