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make `tidy-alphabetical` use a natural sort The idea here is that these lines should be correctly sorted, even though a naive string comparison would say they are not: ``` foo2 foo10 ``` This is the ["natural sort order"](https://en.wikipedia.org/wiki/Natural_sort_order). There is more discussion in [#t-compiler/help > tidy natural sort](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/tidy.20natural.20sort/with/519111079) Unfortunately, no standard sorting tools are smart enough to to this automatically (casting some doubt on whether we should make this change). Here are some sort outputs: ``` > cat foo.txt | sort foo foo1 foo10 foo2 mp mp1e2 np", np1e2", > cat foo.txt | sort -n foo foo1 foo10 foo2 mp mp1e2 np", np1e2", > cat foo.txt | sort -V foo foo1 foo2 foo10 mp mp1e2 np1e2", np", ``` Disappointingly, "numeric" sort does not actually have the behavior we want. It only sorts by numeric value if the line starts with a number. The "version" sort looks promising, but does something very unintuitive if you look at the final 4 values. None of the other options seem to have the desired behavior in all cases: ``` -b, --ignore-leading-blanks ignore leading blanks -d, --dictionary-order consider only blanks and alphanumeric characters -f, --ignore-case fold lower case to upper case characters -g, --general-numeric-sort compare according to general numerical value -i, --ignore-nonprinting consider only printable characters -M, --month-sort compare (unknown) < 'JAN' < ... < 'DEC' -h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G) -n, --numeric-sort compare according to string numerical value -R, --random-sort shuffle, but group identical keys. See shuf(1) --random-source=FILE get random bytes from FILE -r, --reverse reverse the result of comparisons --sort=WORD sort according to WORD: general-numeric -g, human-numeric -h, month -M, numeric -n, random -R, version -V -V, --version-sort natural sort of (version) numbers within text ``` r? ```@Noratrieb``` (it sounded like you know this code?)
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.