--- a/contrib/bash_completion	Tue May 12 01:03:12 2020 +0200
+++ b/contrib/bash_completion	Mon May 11 08:13:40 2020 +0200
@@ -160,7 +160,10 @@
     if [[ -n "$aliashg" ]]; then
       aliashg=${aliashg#"alias $hg='"}
       aliashg=${aliashg%"'"}
-      hg=$aliashg
+      # `source`d aliases break completion, so ignore them
+      if [[ "${aliashg:0:7}" != "source " ]]; then
+        hg=$aliashg
+      fi
     fi
 
     COMPREPLY=()