Shortest accumulator (so far?): 

local our @dirs;
m{^(.*/)(?{ push @dirs, $^N })(?!)};

[download]

In requested order: 

local our @dirs;
m{^(.*?/)(?{ push @dirs, $^N })(?!)};

[download]

In reply to Re: Alternative for a directory builder by ikegami
in thread Alternative for a directory builder by cyber-guard

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