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[PATCH] Document interaction of 'print -P' and 'print -f'.

 Doc/Zsh/builtins.yo |  3 +++
 Test/D01prompt.ztst | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo
index 37e3865..81c201f 100644
--- a/Doc/Zsh/builtins.yo
+++ b/Doc/Zsh/builtins.yo
@@ -1252,6 +1252,9 @@ Perform prompt expansion (see
 ifzman(EXPANSION OF PROMPT SEQUENCES in zmanref(zshmisc))\
 ifnzman(noderef(Prompt Expansion))\
+In combination with `tt(-f)',
+prompt escape sequences are parsed only within interpolated arguments,
+not within the format string.
 Ignore the escape conventions of tt(echo).
diff --git a/Test/D01prompt.ztst b/Test/D01prompt.ztst
index 607ffb6..0818728 100644
--- a/Test/D01prompt.ztst
+++ b/Test/D01prompt.ztst
@@ -82,9 +82,12 @@
 # We could test for that, but we can't be bothered.
 # I hope LC_ALL is enough to make the format what's expected.
+# The $date2 assignment tests that %s is interpreted as a printf format
+# string, rather than as a prompt escape (end standout).
   date1=$(print -P %w)
-  date2=$(print -P %W)
+  date2=$(print -P -f %s %W)
   date3=$(print -P %D)
   if [[ $date1 != [A-Z][a-z][a-z][[:blank:]]##[0-9]## ]]; then
     print "Date \`$date1' is not in the form \`Day DD' (e.g. \`Mon 1'"
@@ -201,3 +204,8 @@
 ?+zsh_directory_name:14> return 0
 ?+fn:7> local d='~[<parent>:l]'
 ?+fn:8> print '~[<parent>:l]'
+# Test that format strings are not subject to prompt expansion
+ print -P -f '%%Sfoo%%s\n' bar
+0:print -P -f

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