codereview: give advice on 'cannot create CL outside default branch'

Fixes #3430.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5981047

diff --git a/lib/codereview/codereview.py b/lib/codereview/codereview.py
index 61e2fd772bf97b2c8782235e2a32b3fd69f3076d..f3cb485953b57b3a87fa63e5fda4102c3648c688 100644 (file)
--- a/lib/codereview/codereview.py
+++ b/lib/codereview/codereview.py
@@ -1309,7 +1309,7 @@ def change(ui, repo, *pats, **opts):
                name = "new"
                cl = CL("new")
                if repo[None].branch() != "default":
-                       return "cannot create CL outside default branch"
+                       return "cannot create CL outside default branch; switch with 'hg update default'"
                dirty[cl] = True
                files = ChangedFiles(ui, repo, pats, taken=Taken(ui, repo))