A tag write refuses NUL and the other control characters; a Dump that fails says so

A NUL written into a tag went into the dump, which the host then could
not write, and Dump said nothing: a success that wrote nothing. Tag
writes, the workspace's, a column's and a pane's, refuse control
characters but tab and newline, DEL, C1 and bytes not UTF-8, EINVAL; and
Dump reports any failure of its own instead of swallowing it.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index b97f68f8..7fdf2176 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -595,7 +595,8 @@ pub const Kill = struct {
 pub const Dump = struct {
     pub const scope: Scope = .session;
     pub fn run(c: Ctx) void {
-        dump.dumpState(c.p) catch {};
+        // Never a Dump said done that wrote nothing: its failure is said.
+        dump.dumpState(c.p) catch |err| c.p.reportError(c.id, "Dump", err);
     }
 };