tests/regression/issue_487/test.proto

syntax = "proto2";
package a.b.c;

message TopLevel {
    optional uint32 field = 1 [default = 0];
    optional NestedTypeA foo = 2;

    message NestedTypeA {
        optional NestedTypeB bar = 1;

        message NestedTypeB {
            optional uint32 foobar = 1;
        }
    }
}