Add diagnostic arg 'current_crate'

Author: jannic

compiler/rustc_metadata/src/errors.rs

@@ -572,6 +572,7 @@ impl SessionDiagnostic<'_> for CannotFindCrate {
     ) -> rustc_errors::DiagnosticBuilder<'_, ErrorGuaranteed> {
         let mut diag = handler.struct_err(rustc_errors::fluent::metadata::cannot_find_crate);
         diag.set_arg("crate_name", self.crate_name);
+        diag.set_arg("current_crate", self.current_crate);
         diag.set_arg("add_info", self.add_info);
         diag.set_arg("locator_triple", self.locator_triple.triple());
         diag.code(error_code!(E0463));