`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, 1 insertions, 1 deletions

diff --git a/src/9p_io.zig b/src/9p_io.zig
index dd755f82..9a38b438 100644
--- a/src/9p_io.zig
+++ b/src/9p_io.zig
@@ -341,7 +341,7 @@ pub const Listener = struct {
             // builtin's failure saying so is (ctl.failureErrno).
             const errno = if (std.mem.indexOf(u8, late, "no such") != null or std.mem.indexOf(u8, late, "not found") != null)
                 pardes.ctlfs.E.NOENT
-            else if (std.mem.indexOf(u8, late, "no space") != null) pardes.ctlfs.E.NOSPC else if (std.mem.indexOf(u8, late, "permission denied") != null) pardes.ctlfs.E.PERM else pardes.ctlfs.E.IO;
+            else if (std.mem.indexOf(u8, late, "no space") != null) pardes.ctlfs.E.NOSPC else if (std.mem.indexOf(u8, late, "permission denied") != null) pardes.ctlfs.E.PERM else if (std.mem.indexOf(u8, late, "invalid") != null) pardes.ctlfs.E.INVAL else pardes.ctlfs.E.IO;
             const failed = pardes.ctlfs.failText(req.tag, errno, late);
             // Its err record says it (the path in it), the one record: it
             // was said with no msg while this waited (fs.write_waits).