0c5d651d0b
Fix for old school error issues, improvements to new school This PR: * Fixes some old school error issues, specifically #33559, #33543, #33366 * Improves wording borrowck errors with match patterns * De-emphasize multi-line spans, so we don't color the single source character when we're trying to say "span starts here" * Rollup of #33392 (which should help fix #33390) r? @nikomatsakis