A bare :N or :N:M look addresses the pane itself, its line N (column M), from every way a look comes; a PDF's :0 has no page 0

A look of `:12` had no path to resolve, so it fell through to a word
search for the text ":12" and found nothing. A digit-led address with
no path now names the looking pane, as `:/re/` already did: its look,
the root's (the keyboard's pane), Look, B3 and an event write-back all
reach it, a terminal's logical lines included. On a PDF, :0 is the
has-no-page miss rather than a refusal.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/test/pdf.zig b/test/pdf.zig
index 6864f247..d1dd5bb0 100644
--- a/test/pdf.zig
+++ b/test/pdf.zig
@@ -442,6 +442,12 @@ test "`:N` on a PDF turns to page N, from the pane and from the root's look, and
     try std.testing.expect(std.mem.indexOf(u8, record, "\nerr ") == null);
     _ = p.serveFs(.{ .tag = 4, .op = .release, .node = log, .handle = h });
     while (p.nextEffect()) |_| {}
+    // Page 0 is no page: the has-no-page miss.
+    p.look_missed = false;
+    pardes.look.lookAt(p, 0, ":0");
+    try std.testing.expect(p.look_missed);
+    try std.testing.expect(std.mem.indexOf(u8, doc.msg[0..doc.msg_len], "has no page 0") != null);
+    p.look_missed = false;
     // A byte offset or a pattern is no PDF address: refused with words.
     pardes.look.lookAt(p, 0, ":#3");
     try std.testing.expect(p.look_missed);