Why this stack overflow?

[frederikhors]

Using this code:

#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, utoipa::ToSchema)]
#[serde(untagged)]
pub enum PlayerFilters {
    And(Vec<Self>),
    Id(Id),
    CreatedAt(DateTime),
    CreatedBy(NullId),
    Number(Number<i64>),
    WithEquipment(Box<EquipmentFilters>),
    HasSkill(bool),
}

if I generate schema from utoipa I get this error:

thread 'main' (19548) has overflowed its stack

if I remove the And(Vec<Self>), it works! Why?

Vec<> moves things already on the heap: I don't need Box.

If I remove #[serde(untagged)] is the same.

#1504 does not fix.

[zdcthomas]

I'm getting a similar error but only when trying to use the swagger ui. The struct I was seeing the problem with was self referential as well.

[frederikhors]

I'm not using swagger, nor activated feature flag. Nothing. Only that code.

[zdcthomas]

It turns out mine was also during generation, but I fixed it using this tag

utoipa/utoipa-gen/src/lib.rs

Line 337 in cdff007

///* `no_recursion` Is used to break from recursion in case of looping schema tree e.g. `Pet` ->

[frederikhors]

I'm switching to aide! 😄