Macro error on compiling code

[redsun82]

On this snippet (and many others in the same crate, after opening in VSCode the contracts/ibc-reflect crate from https://github.com/CosmWasm/cosmwasm (that crate is excluded from the root workspace so it won't get indexed when the repo is opened from the root), rust-analyzer presents a macro error:

This is the code:

#[cw_serde]
pub enum ExecuteMsg {
    AsyncAck {
        /// Existing channel where the packet was received
        channel_id: String,
        /// Sequence number of the packet that was received
        packet_sequence: Uint64,
        /// The acknowledgement to send back
        ack: IbcAcknowledgement,
    },
}

and this is what expanding recursively the macro gives:

// Recursive expansion of cw_serde macro
// ======================================

#[derive(
    ::cosmwasm_schema::serde::Serialize,
    ::cosmwasm_schema::serde::Deserialize,
    ::std::clone::Clone,
    ::std::fmt::Debug,
    ::std::cmp::PartialEq,
    ::cosmwasm_schema::schemars::JsonSchema,
    ::cosmwasm_schema::cw_schema::Schemaifier,
)]
#[allow(clippy::derive_partial_eq_without_eq)]
#[serde(crate = ":: cosmwasm_schema::serde")]
#[schemaifier(crate = ":: cosmwasm_schema::cw_schema")]
#[schemars(crate = ":: cosmwasm_schema::schemars")]
#[serde(rename_all = "snake_case")]
pub enum ExecuteMsg {
    AsyncAck {
        #[doc = " Existing channel where the packet was received"]
        channel_id: String,
        #[doc = " Sequence number of the packet that was received"]
        packet_sequence: Uint64,
        #[doc = " The acknowledgement to send back"]
        ack: IbcAcknowledgement,
    },
}

(seems like it doesn't go further on the schemaifier/schemars macros).

I may try to make a minimal reproduction of this later, but I might not have the time to do it any time soon.

rust-analyzer version: 0.3.2527-standalone

rustc version: rustc 1.88.0 (6b00bc388 2025-06-23)

editor or extension: VSCode 0.3.2527
relevant settings: -
repository link (if public, optional): https://github.com/CosmWasm/cosmwasm
code snippet to reproduce: https://github.com/CosmWasm/cosmwasm/blob/da905f21598052bcae26aec82763054b699bf618/contracts/ibc-reflect/src/msg.rs#L10-L20

[ChayimFriedman2]

(seems like it doesn't go further on the schemaifier/schemars macros).

"Expand macro recursively" doesn't expand derives, so this is expected and not the cause.

[ChayimFriedman2]

Can you copy-paste the macro output into the editor and try to expand the derive, to see which macro causes the error?

[intrigus-lgtm]

(This issue has been created in response to my issue, github/codeql#19982)
👋
I was able to further reduce this 🎉

cat src/lib.rs

pub struct SchemaGenerator {}

impl SchemaGenerator {
    pub fn subschema_for<T: ?Sized>(self) -> String {
        "f".to_string()
    }
}

fn json_schema() -> std::vec::Vec<String> {
    let gen: SchemaGenerator = SchemaGenerator {};
    vec![gen.subschema_for::<bool>()]
}

and

cat Cargo.toml

[package]
name = "ibc-reflect"
version = "0.0.0"
authors = ["Bla bla <blablabla@local.local>"]
edition = "2021"
publish = false
license = "Apache-2.0"

[lib]
crate-type = ["cdylib", "rlib"]

Interestingly, if you replace

vec![gen.subschema_for::<bool>()]

with

vec![SchemaGenerator {}.subschema_for::<bool>()]

it works...

[ChayimFriedman2]

Thanks for reducing! This is the same as #20153 then, which already has a fix up: #20164.