Attribute Macro contract 

#[contract]

The main contract proc macro.

Applied to a module containing a contract struct and impl block. Extracts metadata and generates schema + extern wrappers.

Errors

This macro will produce compile errors if:

• The module has no content (just a declaration like mod foo;)
• The module contains glob imports (use foo::*)
• The module contains relative imports (use self::, use super::, use crate::)
• The module contains multiple pub struct declarations
• The module contains no pub struct
• The module contains no impl block for the contract struct
• A public method has no self receiver (associated functions)
• A public method has generic type or const parameters
• A public method is async
• A public method consumes self instead of borrowing it
• A public method uses impl Trait in parameters or return type