3 files changed, 2 insertions, 3 deletions
diff --git a/lib/net/ftp.rb b/lib/net/ftp.rb
index f393a15bff..4ed2517018 100644
--- a/lib/net/ftp.rb
+++ b/lib/net/ftp.rb
@@ -322,7 +322,7 @@ module Net
       sock = TCPServer.open(@sock.addr[3], 0)
       port = sock.addr[1]
       host = sock.addr[3]
-      resp = sendport(host, port)
+      sendport(host, port)
       return sock
     end
     private :makeport
diff --git a/lib/net/http.rb b/lib/net/http.rb
index 20c9bb7c92..33c88c8ce5 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -1563,7 +1563,7 @@ module Net   #:nodoc:
     # or sub-type is not given (e.g. "Content-Type: text").
     def sub_type
       return nil unless @header['content-type']
-      main, sub = *self['Content-Type'].split(';').first.to_s.split('/')
+      _, sub = *self['Content-Type'].split(';').first.to_s.split('/')
       return nil unless sub
       sub.strip
     end
diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index 9de6395236..c3dda46606 100644
--- a/lib/net/imap.rb
+++ b/lib/net/imap.rb
@@ -2680,7 +2680,6 @@ module Net
         token = match(T_ATOM)
         name = token.value.upcase
         match(T_SPACE)
-        mailbox = astring
         data = []
         token = lookahead
         if token.symbol == T_SPACE