110777b60c
use `check_region_obligations_and_report_errors` to avoid ICEs If we don't call `process_registered_region_obligations` before `resolve_regions_and_report_errors` then we'll ICE if we have any region obligations, and `check_region_obligations_and_report_errors` just does both of these for us in a nice convenient function. Fixes #53475 r? types
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.