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update overflow handling in the new trait solver implements https://hackmd.io/QY0dfEOgSNWwU4oiGnVRLw?view. I want to clean up this doc and add it to the rustc-dev-guide, but I think this PR is ready for merge as is, even without the dev-guide entry. r? `@compiler-errors`
For more information about how rustc works, see the rustc dev guide.