std: Fix create_dir_all for empty paths #23383
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Recent changes in path semantics meant that if none of the components in a
relative path existed as a part of a call to `create_dir_all` then the call
would fail as `create_dir("")` would be attempted and would fail with an OS
error.
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alexcrichton
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Mar 23, 2015
Conflicts: src/libstd/fs/mod.rs
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Recent changes in path semantics meant that if none of the components in a
relative path existed as a part of a call to
create_dir_allthen the callwould fail as
create_dir("")would be attempted and would fail with an OSerror.
Closes #23624