Implement create_dir_all() to operate iteratively instead of recursively#148196

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asder8215 wants to merge 7 commits intorust-lang:mainfrom

asder8215:std-fs-iterative-create-dir-all

Commits on Oct 28, 2025

Fixes #124309. create_dir_all() operates iteratively instead of recursively.
asder8215
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changed the while condition loop construct to just a loop break construct for collecting uncreated directories
asder8215
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Commits on Oct 29, 2025

iterates through the Ancestor iterator to create the first nonexistent directory and uses a boxed slice to pre-allocate memory for uncreated directories and iterate through & create them efficiently
asder8215
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Commits on Nov 10, 2025

vec only collects uncreated directories without resizing
asder8215
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Commits on Nov 18, 2025