zsh-users/21903: Fix ${...?...} in interactive shell.

On failure should abort back to top level, but we reset the error
flag around commands.  Add a hard error flag that's only reset at top level.

1 files changed, 8 insertions, 1 deletions

diff --git a/Src/zsh.h b/Src/zsh.h
index 996bc3369..2dc5e7e2a 100644
--- a/Src/zsh.h
+++ b/Src/zsh.h
@@ -2807,7 +2807,14 @@ enum errflag_bits {
     /*
      * User interrupt.
      */
-    ERRFLAG_INT = 2
+    ERRFLAG_INT = 2,
+    /*
+     * Hard error --- return to top-level prompt in interactive
+     * shell.  In non-interactive shell we'll typically already
+     * have exited.  This is reset by "errflag = 0" in
+     * loop(toplevel = 1, ...).
+     */
+    ERRFLAG_HARD = 4
 };
 
 /***********/