diff -r cc5a040fe150 -r b0041036214e mercurial/wireprotoframing.py
--- a/mercurial/wireprotoframing.py	Wed Mar 28 15:05:39 2018 -0700
+++ b/mercurial/wireprotoframing.py	Mon Mar 26 10:50:36 2018 -0700
@@ -45,6 +45,7 @@
 FRAME_TYPE_BYTES_RESPONSE = 0x04
 FRAME_TYPE_ERROR_RESPONSE = 0x05
 FRAME_TYPE_TEXT_OUTPUT = 0x06
+FRAME_TYPE_PROGRESS = 0x07
 FRAME_TYPE_STREAM_SETTINGS = 0x08
 
 FRAME_TYPES = {
@@ -54,6 +55,7 @@
     b'bytes-response': FRAME_TYPE_BYTES_RESPONSE,
     b'error-response': FRAME_TYPE_ERROR_RESPONSE,
     b'text-output': FRAME_TYPE_TEXT_OUTPUT,
+    b'progress': FRAME_TYPE_PROGRESS,
     b'stream-settings': FRAME_TYPE_STREAM_SETTINGS,
 }
 
@@ -107,6 +109,7 @@
     FRAME_TYPE_BYTES_RESPONSE: FLAGS_BYTES_RESPONSE,
     FRAME_TYPE_ERROR_RESPONSE: FLAGS_ERROR_RESPONSE,
     FRAME_TYPE_TEXT_OUTPUT: {},
+    FRAME_TYPE_PROGRESS: {},
     FRAME_TYPE_STREAM_SETTINGS: {},
 }