Macro dispatch_source_enum

macro_rules! dispatch_source_enum {
    ($enum_type:ident, $enum_value:expr, |$inner_name:ident| $body:expr) => { ... };
}

Usage: dispatch_source_enum!(EnumType, enum_value, |inner_ident| body).

Inside body:

• use inner_ident to represent the matched variant.
• use PropType to represent the concrete property type.
• use SplitType to represent the concrete split type.

Expands to:

match enum_value {
    EnumType::Variant1(inner_ident) => {
        body
    }
    ...
}

Note: inner_ident must be passed as an argument due to macro hygiene.