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### Spirit V3.0.4 (Boost V1.71.0)

- Explicitly delete all non implemented assignment operators. GH#489 Romain Geissler
- Unpublish `x3/support/utility/testing.hpp`. GH#492
- Removed unused `is_char` and `is_string` traits. GH#507
- Simplified `string_traits`. GH#507
- `raw` parser attribute materialization issue. GH#509
- Removed static assert guarding unwanted attribute materialization that happens when rule parser producing an attribute called without an actual attribute. See GH#511 for the discussion.