gh-156891: Fix shlex source inclusion at EOF - #156892
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Fix shlex source inclusion when the source filename is the final token of its parent stream. Newly pushed streams now start with a valid lexical state, and popping a stream restores the parent state.
Keep the regression coverage focused on resetting lexical state when a new source is pushed. Co-authored-by: lipengyu <lipengyu@kylinos.cn>
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Fix shlex source inclusion when the source filename is the final token of its parent stream. Newly pushed streams now start with a valid lexical state, and popping a stream restores the parent state.
shlexsilently discards a sourced stream when the source filename ends at EOF #156891