Function notmuch_sys::notmuch_message_properties_value

pub unsafe extern fn notmuch_message_properties_value(properties: *const notmuch_message_properties_t)
                                                      -> *const c_char

Return the value from the current (key,value) pair.

This could be useful if iterating for a prefix.

@since libnotmuch 4.4 (notmuch 0.23)