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For shell constructs like echo hello & wait $! the process_tokens() method ended up with a situation where "token" in the "name, value = token" assignment was a list of tuples and not the expected tuple, causing the assignment to fail. There were already two for loops (one in _parse_shell(), one in process_tokens()) which iterated over token lists. Apparently the actual nesting can also be deeper. Now there is just one such loop in process_token_list() which calls itself recursively when it detects that a list entry is another list. As a side effect (improvement?!) of the loop removal in _parse_shell(), the local function definitions in process_tokens() get executed less often. Fixes: [YOCTO #10668] (Bitbake rev: 887ea6d25cee5114365dfbf1130603599e13ee80) Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>