Macro serialize_struct 

macro_rules! serialize_struct {
    ($struct:ident($($arg:tt $(: $bound:tt)?),*)[$num_fields:expr_2021]{$($field_name:ident[$column_name:tt]: $type:ty),* }) => { ... };
}

Generate SerializeWithContext implementation parameterized by context type for a struct.

Arguments

• $struct - name of the struct type.
• $arg - type arguments.
• $bound - optional trait bound for type argument $arg.
• $num_fields - the number of struct fields.
• $field_name - field name.
• $type - field type.