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Add note to `find_const_ty_from_env` Add a note to `find_const_ty_from_env` to explain why it has an `unwrap` which "often" causes ICEs. Also, uplift it into the new trait solver. This avoids needing to go through the interner to call this method which is otherwise an inherent method in the compiler. I can remove this part if desired. r? `@boxyuwu`
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.