# HG changeset patch
# User Petter T. <petter.vilhelm@gmail.com>
# Date 1698423560 -7200
#      Fri Oct 27 18:19:20 2023 +0200
# Node ID 4c643f660de4c4580f5ee57c7e631ca519250db0
# Parent  90f868cc854c0ee94bd87ccc8bb4e395c5ea4b51
Swallow echo_code() exception on nameless functions in bytecode interpreter

Workaround for possible weakness in how echo works. E.g.:

function h = t()
  h = @() 1 + 1;
  h()
end

Does not echo '1 + 1' since there is no echo () call in the
tree_evaluator for anon. function calls.

* pt-bytecode-vm.cc: Swallow exception

diff -r 90f868cc854c -r 4c643f660de4 libinterp/parse-tree/pt-bytecode-vm.cc
--- a/libinterp/parse-tree/pt-bytecode-vm.cc	Fri Oct 27 18:19:14 2023 +0200
+++ b/libinterp/parse-tree/pt-bytecode-vm.cc	Fri Oct 27 18:19:20 2023 +0200
@@ -6167,7 +6167,19 @@
             m_tw->set_echo_file_pos (line);
           }
 
-        m_tw->echo_code (line);
+        try
+          {
+            m_tw->echo_code (line);
+          }
+        catch (execution_exception &)
+          {
+            // echo_code() might throw if there is no file info
+            // attached to the executing function.
+            // Just ignore it.
+            // TODO: Might be a bug? Does this apply to the tree_evaluator?
+            //       Run "echo on all; test bytecode.tst" to recreate.
+          }
+
         m_tw->set_echo_file_pos (line + 1);
       }
 bail_echo: