`answer z` quotes `z`, a bare `name` says it names nothing, and `Repl klingon` is invalid (EINVAL), its message citing no doc path

A refused answer quoted the word `answer`, not the choice refused. A
`name` with nothing after it was an unknown control message. A Repl of
no such language failed EIO with a pointer into the reference; it now
says `invalid language` (EINVAL, here and through a mount) and how many
more there are. A builtin's failure that says invalid anywhere is
EINVAL, as 9ns reads it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index 1659a94b..803686e0 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -1695,7 +1695,9 @@ test "a REPL bound for a language takes the exec made on a body in it; tags, Exe
         var want: [32]u8 = undefined;
         try std.testing.expect(th.logHas(p, try std.fmt.bufPrint(&want, "ask {d} repl a b\n", .{file.serial})));
         // A choice not offered is refused, and the question stands.
-        try std.testing.expectEqual(ctlfs.E.INVAL, th.wr(p, ctlfs.Node.of(file.serial, .ctl), "answer z\n").errno());
+        const refused = th.wr(p, ctlfs.Node.of(file.serial, .ctl), "answer z\n");
+        try std.testing.expectEqual(ctlfs.E.INVAL, refused.errno());
+        try std.testing.expect(std.mem.endsWith(u8, refused.reply.ename, " \"z\""));
         try std.testing.expectEqual(Pane.Prompt.repl_choice, file.prompt);
         const answered = th.wr(p, ctlfs.Node.of(file.serial, .ctl), "answer a\n");
         try std.testing.expectEqual(ctlfs.Status.ok, answered.reply.status);