* Add case guards to parser
* Add pattern guards to infer types and fcode generation
* Add functions guards
* Add test for patterns guards
* Update docs
* Update CHANGELOG.md
* Remove stateful context from Env for guards
* Elaborate on guards
* Add failing test for stateful pattern guards
* Implement multiple guards
* Fix tests
* Disable aevm related tests
* Split the sentence before if and otherwise
* Fix type in docs
* Implement multiple exprs in the same guard
* Fix pretty printing
* Change tests to include multiple guards
* Add test for non-boolean guards
* Desugar clauses with guards
* Fix incomplete patterns bug
* Fix docs
* Compile to icode when no guards are used
* Revert "Disable aevm related tests"
This reverts commit e828099bd97dffe11438f2e48f3a92ce3641e85b.
* 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
* Updated tests, banned type decls and toplevel letvals
* Properly ban nested contracts
* Fix including by path
* Fix error message test
* Fix prettpr attr display. Make dialyzer happy
* More tests
* Fixed type printing
* Updated docs
* Allow block with separate type signature and definition of a function
For instance,
```
function
add : (int, int) => int
add(x, y) = x + y
```
cc #196
* Allow pattern matching in left-hand sides
* Changelog
* Fix type spec
* partial case-on-constructor
* Changelog for pattern-matching lets
