Function ICU4XScriptWithExtensionsBorrowed_get_script_extensions_set 

#[unsafe(no_mangle)]
extern "C" fn ICU4XScriptWithExtensionsBorrowed_get_script_extensions_set<'a>(
    this: &ICU4XScriptWithExtensionsBorrowed<'a>,
    script: u16,
) -> Box<ICU4XCodePointSetData>