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We now fallback type variables using the following rules: * Construct a coercion graph `A -> B` where `A` and `B` are unresolved type variables or the `!` type. * Let D be those variables that are reachable from `!`. * Let N be those variables that are reachable from a variable not in D. * All variables in (D \ N) fallback to `!`. * All variables in (D & N) fallback to `()`. |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.