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Rollup merge of #145033 - nnethercote:fix-144994, r=fmease
Reimplement `print_region` in `type_name.rs`.
Broken by rust-lang/rust#144776; this is reachable after all.
Fixes rust-lang/rust#144994.
The commit also adds a lot more cases to the `type-name-basic.rs`, because it's currently very anaemic. This includes some cases where region omission does very badly; these are marked with FIXME.
r? `@fmease`
