Macro builder_setter 

macro_rules! builder_setter {
    ($field:ident, $type:ty, $doc:expr) => { ... };
}

Generates a scalar field setter method.

Creates a setter method that takes ownership of self, sets a field to Some(value), and returns self for method chaining.

Arguments

• $field - The field name
• $type - The field type
• $doc - Documentation string for the setter

Examples

impl MessageBuilder {
    builder_setter!(id, u32, "Sets the CAN message ID");
}

// Expands to:
// /// Sets the CAN message ID
// #[must_use = "builder method returns modified builder"]
// pub fn id(mut self, id: u32) -> Self {
//     self.id = Some(id);
//     self
// }