Adding upstream version 1.2+20240521.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/inputs/nestedtwice/nestedtwice.proto

@@ -0,0 +1,40 @@
+syntax = "proto3";
+
+package nestedtwice;
+
+/* Test doc. */
+message Test {
+  /* Top doc. */
+  message Top {
+    /* Middle doc. */
+    message Middle {
+      /* TopMiddleBottom doc.*/
+      message TopMiddleBottom {
+        // TopMiddleBottom.a doc.
+        string a = 1;
+      }
+      /* EnumBottom doc. */
+      enum EnumBottom{
+        /* EnumBottom.A doc. */
+        A = 0;
+        B = 1;
+      }
+      /* Bottom doc. */
+      message Bottom {
+        /* Bottom.foo doc. */
+        string foo = 1;
+      }
+      reserved 1;
+      /* Middle.bottom doc. */
+      repeated Bottom bottom = 2;
+      repeated EnumBottom enumBottom=3;
+      repeated TopMiddleBottom topMiddleBottom=4;
+      bool bar = 5;
+    }
+    /* Top.name doc. */
+    string name = 1;
+    Middle middle = 2;
+  }
+  /* Test.top doc. */
+  Top top = 1;
+}