(mount) Make it clear that $' strings are not supported

contrib/mount

@@ -26,19 +26,11 @@ _reply_compgen_array()
     # We also have to add another round of escaping to $cur.
     local ecur="$cur"
     ecur="${ecur//\\/\\\\}"
-    ecur="${ecur/#$\'/\$\'}"
 
     # Actually generate completions.
-    local oldifs="$IFS"
+    local oldifs=$IFS
     IFS=$'\n' eval 'COMPREPLY=(`compgen -W "$wlist" -- "${ecur}"`)'
-    IFS="$oldifs"
-
-    # Strip starting $' in reply if present in cur.
-    # This is necesarry because readline interprets everything after ' as a
-    # separate word for completion.
-    if [[ $cur == $\'* ]]; then #'
-        COMPREPLY=( "${COMPREPLY[@]/#$\'}" )
-    fi
+    IFS=$oldifs
 }
 
 # Complete linux fstab entries.

test/lib/completions/mount.exp

@@ -76,11 +76,10 @@ sync_after_int
 assert_complete {/mnt/nice\$test-path} {mnt /mnt/nice\$}
 sync_after_int
 
-assert_complete {$'/mnt/nice-test-path'} {mnt $'/mnt/nice-}
-sync_after_int
-
-assert_complete {$'/mnt/nice\ntest-path'} {mnt $'/mnt/nice\n}
-sync_after_int
+# This does not work. Proper support for this requires smarter parsing of
+# $COMP_LINE and it's not worth doing just for mount.
+#assert_complete {$'/mnt/nice\ntest-path'} {mnt $'/mnt/nice\n}
+#sync_after_int
 
 
 teardown