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Correctly instantiate recursion variables under nested aliases

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Like we instantiate nested lambda set variables and nested OIOP
variables for aliases, we need to do the same for recursion variables.
This commit is contained in:
Ayaz Hafiz 2023-04-12 13:59:24 -05:00
parent f2e12724d3
commit f33651bf6a
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GPG key ID: 0E2A37416A25EF58
4 changed files with 251 additions and 344 deletions
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5
crates/compiler/can/src/def.rs
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@ -2925,12 +2925,14 @@ fn correct_mutual_recursive_type_alias<'a>(
};
let mut new_lambda_sets = ImSet::default();
let mut new_recursion_variables = ImSet::default();
let mut new_infer_ext_vars = ImSet::default();
alias_type.instantiate_aliases(
alias_region,
&can_instantiate_symbol,
var_store,
&mut new_lambda_sets,
&mut new_recursion_variables,
&mut new_infer_ext_vars,
);
@ -2953,6 +2955,9 @@ fn correct_mutual_recursive_type_alias<'a>(
.map(|var| LambdaSet(Type::Variable(*var))),
);
// add any new recursion variables
alias.recursion_variables.extend(new_recursion_variables);
// add any new infer-in-output extension variables that the instantiation created to the current alias
alias
.infer_ext_in_output_variables