File 2366-Fix-false-Dialyzer-warnings-for-erl_tar-ta... of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 2366-Fix-false-Dialyzer-warnings-for-erl_tar-table-1.patch of Package erlang (Revision 88a02c2ce6d63718530f078daeb49b67)

Currently displaying revision 88a02c2ce6d63718530f078daeb49b67 , Show latest

From 21214178d05ffa482d7377a22285b38834566d2c Mon Sep 17 00:00:00 2001
From: Guilherme Andrade <g@gandrade.net>
Date: Mon, 1 Jan 2018 17:48:09 +0000
Subject: [PATCH 1/2] Fix false Dialyzer warnings for erl_tar:table/1

'tar_entry()' values are only returned if we specify the 'verbose'
option when calling table/2, which table/1 doesn't do.

Now, it appears that Dialyzer as of OTP 20 is clever enough to realize
that the return type of table/1 must intersect with the return type of
table/2, and so it ignores the fact that table/1 says it returns
strings, and therefore its callers are expected to be dealing with
'tar_entry()' tuples, and never with strings.

This is obviously a mismatch between what the code does and what the
spec says is does, leading to false Dialyzer warnings on code that uses
table/1 (and, presumably, also table/2 when called without
the 'verbose' option.)
---
 lib/stdlib/src/erl_tar.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stdlib/src/erl_tar.erl b/lib/stdlib/src/erl_tar.erl
index 76f0b38108..5ee584d612 100644
--- a/lib/stdlib/src/erl_tar.erl
+++ b/lib/stdlib/src/erl_tar.erl
@@ -189,7 +189,7 @@ table(Name) ->
 %% Returns a list of names of the files in the tar file Name.
 %% Options accepted: compressed, verbose, cooked.
 -spec table(open_handle(), [compressed | verbose | cooked]) ->
-                   {ok, [tar_entry()]} | {error, term()}.
+                   {ok, [string() | tar_entry()]} | {error, term()}.
 table(Name, Opts) when is_list(Opts) ->
     foldl_read(Name, fun table1/4, [], table_opts(Opts)).
 
-- 
2.15.1

Places

File 2366-Fix-false-Dialyzer-warnings-for-erl_tar-table-1.patch of Package erlang (Revision 88a02c2ce6d63718530f078daeb49b67)

Places