1 files changed, 27 insertions, 0 deletions
diff --git a/gopls/internal/lsp/testdata/stub/stub_typedecl_group.go b/gopls/internal/lsp/testdata/stub/stub_typedecl_group.go
new file mode 100644
index 000000000..f82401faf
--- /dev/null
+++ b/gopls/internal/lsp/testdata/stub/stub_typedecl_group.go
@@ -0,0 +1,27 @@
+package stub
+
+// Regression test for Issue #56825: file corrupted by insertion of
+// methods after TypeSpec in a parenthesized TypeDecl.
+
+import "io"
+
+func newReadCloser() io.ReadCloser {
+	return rdcloser{} //@suggestedfix("rd", "refactor.rewrite", "")
+}
+
+type (
+	A        int
+	rdcloser struct{}
+	B        int
+)
+
+func _() {
+	// Local types can't be stubbed as there's nowhere to put the methods.
+	// The suggestedfix assertion can't express this yet. TODO(adonovan): support it.
+	type local struct{}
+	var _ io.ReadCloser = local{} // want error: `local type "local" cannot be stubbed`
+}
+
+type (
+	C int
+)