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collect and instantiate hidden variables

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This commit is contained in:
Folkert 2020-10-25 19:11:03 +01:00
parent 2c55fa5ec5
commit f13c28fe7f
5 changed files with 59 additions and 19 deletions
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20
compiler/can/src/annotation.rs
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@ -195,6 +195,18 @@ fn can_annotation_help(
vars.push((name.clone(), arg_ann));
}
// make sure the recursion variable is freshly instantiated
if let Type::RecursiveTagUnion(rvar, _, _) = &mut actual {
let new = var_store.fresh();
substitutions.insert(*rvar, Type::Variable(new));
*rvar = new;
}
// make sure hidden variables are freshly instantiated
for var in alias.hidden_variables.iter() {
substitutions.insert(*var, Type::Variable(var_store.fresh()));
}
// instantiate variables
actual.substitute(&substitutions);
@ -320,9 +332,17 @@ fn can_annotation_help(
inner_type
};
let mut hidden_variables = MutSet::default();
hidden_variables.extend(alias_actual.variables());
for loc_var in lowercase_vars.iter() {
hidden_variables.remove(&loc_var.value.1);
}
let alias = Alias {
region,
vars: lowercase_vars,
hidden_variables,
uniqueness: None,
typ: alias_actual,
};