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Build error with schema name "Value" #1189

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HollayHorvath opened this issue Nov 5, 2024 · 0 comments
Open

Build error with schema name "Value" #1189

HollayHorvath opened this issue Nov 5, 2024 · 0 comments

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@HollayHorvath
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When I have a schema component with the name Value the #[derive(OpenApi)] produces unparsable tokens:

error: expected expression, found `,`
 --> src/main.rs:8:10
  |
8 | #[derive(OpenApi)]
  |          ^^^^^^^ expected expression
  |
  = note: this error originates in the derive macro `OpenApi` (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected one of `.`, `;`, `?`, `else`, or an operator, found `)`
 --> src/main.rs:8:10
  |
8 | #[derive(OpenApi)]
  |          ^^^^^^^ expected one of `.`, `;`, `?`, `else`, or an operator
  |
  = note: this error originates in the derive macro `OpenApi` (in Nightly builds, run with -Z macro-backtrace for more info)

error: proc-macro derive produced unparsable tokens
 --> src/main.rs:8:10
  |
8 | #[derive(OpenApi)]
  |          ^^^^^^^

The repro itself is shorter than the error:

use utoipa::{OpenApi, ToSchema};

#[derive(ToSchema)]
struct Value {
    val: &'static str,
}

#[derive(OpenApi)]
#[openapi(components(schemas(Value)))]
struct Api;

fn main() {
    println!("Hello, world!");
}

Renaming the Value struct fixes the issue.

The error is quite hard to decipher as the error reported has nothing to do with the actual problem.
It was working fine under Utoipa 4.x but it's broken under 5.0.

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