* Change syntax tree and parser
* Add assign pattern to type inference
* Use check_expr instead of hard-coded type
* Add fcode generation for assign pattern
* Implement rename_spat for assign pattern
* Add tests
* Update CHANGELOG.md
* Update docs and changelog
* Add letpat to aeso_syntax_utils:fold
* Use Plus instead of Scoped
Gaith Hallak
e8a171dc45