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[ty] Always pass NO_INSTANCE_FALLBACK in try_call_dunder_with_policy (#18315)

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## Summary

The previous `try_call_dunder_with_policy` API was a bit of a footgun
since you needed to pass `NO_INSTANCE_FALLBACK` in *addition* to other
policies that you wanted for the member lookup. Implicit calls to dunder
methods never access instance members though, so we can do this
implicitly in `try_call_dunder_with_policy`.

No functional changes.
This commit is contained in:
David Peter 2025-05-26 13:20:27 +02:00 • committed by GitHub
parent f885cb8a2f
commit e1b662bf5d
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2 changed files with 13 additions and 6 deletions
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16
crates/ty_python_semantic/src/types.rs
View file

@ -3214,8 +3214,7 @@ impl<'db> Type<'db> {
&mut CallArgumentTypes::positional([Type::StringLiteral(
StringLiteralType::new(db, Box::from(name.as_str())),
)]),
MemberLookupPolicy::MRO_NO_OBJECT_FALLBACK
| MemberLookupPolicy::NO_INSTANCE_FALLBACK,
MemberLookupPolicy::MRO_NO_OBJECT_FALLBACK,
)
.map(|outcome| Symbol::bound(outcome.return_type(db)))
// TODO: Handle call errors here.
@ -4415,7 +4414,7 @@ impl<'db> Type<'db> {
db,
name,
&mut argument_types,
MemberLookupPolicy::NO_INSTANCE_FALLBACK,
MemberLookupPolicy::default(),
)
}
@ -4423,6 +4422,9 @@ impl<'db> Type<'db> {
/// particular, this allows to specify `MemberLookupPolicy::MRO_NO_OBJECT_FALLBACK` to avoid
/// looking up dunder methods on `object`, which is needed for functions like `__init__`,
/// `__new__`, or `__setattr__`.
///
/// Note that `NO_INSTANCE_FALLBACK` is always added to the policy, since implicit calls to
/// dunder methods never access instance members.
fn try_call_dunder_with_policy(
self,
db: &'db dyn Db,
@ -4430,8 +4432,14 @@ impl<'db> Type<'db> {
argument_types: &mut CallArgumentTypes<'_, 'db>,
policy: MemberLookupPolicy,
) -> Result<Bindings<'db>, CallDunderError<'db>> {
// Implicit calls to dunder methods never access instance members, so we pass
// `NO_INSTANCE_FALLBACK` here in addition to other policies:
match self
.member_lookup_with_policy(db, name.into(), policy)
.member_lookup_with_policy(
db,
name.into(),
policy | MemberLookupPolicy::NO_INSTANCE_FALLBACK,
)
.symbol
{
Symbol::Type(dunder_callable, boundness) => {

3
crates/ty_python_semantic/src/types/infer.rs
View file

@ -3231,8 +3231,7 @@ impl<'db> TypeInferenceBuilder<'db> {
)),
value_ty,
]),
MemberLookupPolicy::NO_INSTANCE_FALLBACK
| MemberLookupPolicy::MRO_NO_OBJECT_FALLBACK,
MemberLookupPolicy::MRO_NO_OBJECT_FALLBACK,
);
match result {