addr, dot and limit on a pane with no text are refused `invalid address: this pane has no text to address`, which a mount reads as EINVAL, not EIO

9ns maps a refusal back to its errno by its words; "this pane has no
text to address" held none it knows. The reference quotes the new words.

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

2 files changed, 2 insertions, 2 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 073a5b8a..b17f150a 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -3274,7 +3274,7 @@ test "a malformed address is bad address syntax; on a pane with no text any addr
     for ([_]tree.PaneFile{ .addr, .dot, .limit }) |file| for ([_][]const u8{ "1", "1x" }) |expr| {
         const refused = wr(p, Node.of(serialOf(p), file), expr);
         try testing.expectEqual(E.INVAL, refused.errno());
-        try testing.expectEqualStrings("this pane has no text to address", refused.reply.ename);
+        try testing.expectEqualStrings("invalid address: this pane has no text to address", refused.reply.ename);
     };
 }
 
diff --git a/src/ninep/pane.zig b/src/ninep/pane.zig
index 6a6b444f..f69813b0 100644
--- a/src/ninep/pane.zig
+++ b/src/ninep/pane.zig
@@ -825,7 +825,7 @@ fn pairOf(text: []const u8) ?State.Range {
     return .{ .q0 = q0, .q1 = q1 };
 }
 
-pub const e_no_text_address = "this pane has no text to address";
+pub const e_no_text_address = "invalid address: this pane has no text to address";
 
 pub const e_addr_failed = "no address: the last one written to addr failed";