noahshaw11 edited a comment on pull request #3964:
URL: https://github.com/apache/couchdb/pull/3964#issuecomment-1074725480


   Listed below are the errors found by Dialyzer via adding the following spec:
   ```
   diff --git a/src/couch/src/couch_server.erl b/src/couch/src/couch_server.erl
   index 3c72e3357..72bd51375 100644
   --- a/src/couch/src/couch_server.erl
   +++ b/src/couch/src/couch_server.erl
   @@ -90,6 +90,9 @@ get_spidermonkey_version() -> 
list_to_binary(?COUCHDB_SPIDERMONKEY_VERSION).
    sup_start_link(N) ->
        gen_server:start_link({local, couch_server(N)}, couch_server, [N], []).
    
   +-spec open(any(), [any()]) ->
   +    {ok, any()} |
   +    {error, all_dbs_active}.
    open(DbName, Options) ->
        try
            validate_open_or_create(DbName, Options),
   ```
   List of errors:
   ```
   src/cpse_test_open_close_delete.erl:0: in 
cpse_test_open_close_delete:cpse_open_non_existent/1[32-38]:Guard test 
             {'error', 'all_dbs_active'} | {'ok', _} =:= 
             __X :: {'not_found', 'no_db_file'} can never succeed
   
   src/cpse_test_open_close_delete.erl:0: in 
cpse_test_open_close_delete:cpse_open_create/1[39-45]:Guard test 
             {'error', 'all_dbs_active'} | {'ok', _} =:= 
             __X :: {'not_found', 'no_db_file'} can never succeed
   
   src/cpse_test_open_close_delete.erl:0: in 
cpse_test_open_close_delete:cpse_open_when_exists/1[46-52]:Guard test 
             {'error', 'all_dbs_active'} | {'ok', _} =:= 
             __X :: {'not_found', 'no_db_file'} can never succeed
   
   src/cpse_test_open_close_delete.erl:0: in 
cpse_test_open_close_delete:cpse_terminate/1[53-59]:Guard test 
             {'error', 'all_dbs_active'} | {'ok', _} =:= 
             __X :: {'not_found', 'no_db_file'} can never succeed
   
   src/mem3_rep.erl:0: in mem3_rep:go/1[106-132]:The pattern 
             {'not_found', 'no_db_file'} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_rep.erl:0: in mem3_rep:with_src_db/2[711-723]:The pattern 
             {'not_found', _} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_reshard_job.erl:0: in 
mem3_reshard_job:wait_source_close_impl/1[499-516]:The pattern 
             {'not_found', _} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_util.erl:0: in mem3_util:ensure_exists/1[294-305]:The pattern 
             'file_exists' can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_util.erl:0: in mem3_util:get_or_create_db/2[548-564]:The pattern 
             {'not_found', 'no_db_file'} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_util.erl:0: in mem3_util:get_or_create_db_int/2[565-582]:The 
pattern 
             {'not_found', 'no_db_file'} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/mem3_util.erl:0: in mem3_util:get_shard_props/1[589-610]:The pattern 
             {'not_found', _} can never match the type 
             {'error', 'all_dbs_active'}
   
   src/hastings_rpc.erl:0: in hastings_rpc:get_or_create_db/2[111-120]:The 
pattern 
             {'not_found', 'no_db_file'} can never match the type 
             {'error', 'all_dbs_active'} | {'ok', _}
    ```


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