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Implement de-generalization for weakened let bindings

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Ayaz Hafiz 2023-01-10 10:51:02 -06:00
parent cb18291aa8
commit 5ccedca093
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1 changed files with 10 additions and 1 deletions
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9
crates/compiler/solve/src/solve.rs
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@ -790,7 +790,16 @@ fn solve(
let_con.def_types, let_con.def_types,
); );
// If the let-binding can be generalized, introduce all variables at the next rank;
// those that persist at the next rank after rank-adjustment will be generalized.
//
// Otherwise, introduce all variables at the current rank; since none of them will
// end up at the next rank, none will be generalized.
if let_con.generalizable.0 {
pools.get_mut(next_rank).extend(pool_variables); pools.get_mut(next_rank).extend(pool_variables);
} else {
pools.get_mut(rank).extend(pool_variables);
}
debug_assert_eq!( debug_assert_eq!(
// Check that no variable ended up in a higher rank than the next rank.. that // Check that no variable ended up in a higher rank than the next rank.. that