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On later stages, the feature is already stable. Result of running: rg -l "feature.let_else" compiler/ src/librustdoc/ library/ | xargs sed -s -i "s#\\[feature.let_else#\\[cfg_attr\\(bootstrap, feature\\(let_else\\)#"
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.