By calling `twin' on the keys of a hash table, following exception occurs:
-------------------------------------------------------------------------------
Class / Object Routine Nature of exception Effect
-------------------------------------------------------------------------------
DS_SPARSE_TABLE_KEYS
copy @3 copy:
<00007F271CD4F598> Feature call on void target. Fail
-------------------------------------------------------------------------------
DS_SPARSE_TABLE_KEYS
copy @3
<00007F271CD4F598> Routine failure. Fail
-------------------------------------------------------------------------------
DS_SPARSE_TABLE_KEYS
twin @3
<00007F271CD4F508> (From ANY) Routine failure. Fail
------------------------------------------------------------------------------
To reproduce call following feature
test_ds_sparse_table_keys
local
l_table: DS_HASH_TABLE [STRING, STRING]
l_list: DS_BILINEAR [STRING]
do
create l_table.make_default
l_list := l_table.keys.twin
end
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