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conditionally use a DelayedAlias

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Folkert 2022-03-16 18:29:40 +01:00
parent f24bfeea99
commit 48b6cd09c7
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1 changed files with 35 additions and 15 deletions
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50
compiler/can/src/annotation.rs
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@ -339,22 +339,42 @@ fn can_annotation_help(
return error;
}
let (type_arguments, lambda_set_variables, actual) =
instantiate_and_freshen_alias_type(
var_store,
introduced_variables,
&alias.type_variables,
args,
&alias.lambda_set_variables,
alias.typ.clone(),
);
// For now, aliases of function types cannot be delayed.
// This is a limitation of the current implementation,
// and this totally should be possible in the future.
let is_import = !symbol.is_builtin() && (env.home != symbol.module_id());
if !is_import && alias.lambda_set_variables.is_empty() {
let mut type_var_to_arg = Vec::new();
Type::Alias {
symbol,
type_arguments,
lambda_set_variables,
actual: Box::new(actual),
kind: alias.kind,
for (loc_var, arg_ann) in alias.type_variables.iter().zip(args) {
let name = loc_var.value.0.clone();
type_var_to_arg.push((name, arg_ann));
}
Type::DelayedAlias(AliasCommon {
symbol,
type_arguments: type_var_to_arg,
lambda_set_variables: alias.lambda_set_variables.clone(),
})
} else {
let (type_arguments, lambda_set_variables, actual) =
instantiate_and_freshen_alias_type(
var_store,
introduced_variables,
&alias.type_variables,
args,
&alias.lambda_set_variables,
alias.typ.clone(),
);
Type::Alias {
symbol,
type_arguments,
lambda_set_variables,
actual: Box::new(actual),
kind: alias.kind,
}
}
}
None => Type::Apply(symbol, args, region),