Fix #99684 through autoref in `write!` macro with a two-phased borrows retrocompat workaround#100202

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danielhenrymantilla wants to merge 3 commits intorust-lang:masterfrom

danielhenrymantilla:fix-99684-self-in-write-dropped-early

Commits on Oct 10, 2022

eddyb autoref trick written by dtolnay and tweaked by danielhenrymantilla

dtolnay
authored and
danielhenrymantilla
committed
Add a 2φ-borrows retro-compat workaround to `write!`
danielhenrymantilla
committed
Fix format-args-temporaries test (fail->pass) & add 2φ-borrows regression tests
danielhenrymantilla
committed