rustc_serialize: don't allocate `String`s as key for `BTreeMap`, when `str` is enough#91626

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bors merged 1 commit intorust-lang:masterfrom

klensy:json-less-alloc

Dec 13, 2021

Commits on Dec 7, 2021

don't allocate strings when str is enought for using as key
klensy
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