075ab03851
This change attempts to resolve issue #7636: Extract into Function does not create a generic function with constraints when extracting generic code. In `FunctionBody::analyze_container`, we now traverse the `ancestors` in search of `AnyHasGenericParams`, and attach any `GenericParamList`s and `WhereClause`s we find to the `ContainerInfo`. Later, in `format_function`, we collect all the `GenericParam`s and `WherePred`s from the container, and filter them to keep only types matching `TypeParam`s used within the newly extracted function body or param list. We can then include the new `GenericParamList` and `WhereClause` in the new function definition. This change only impacts `TypeParam`s. `LifetimeParam`s and `ConstParam`s are out of scope for this change.
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