Polymorphism support (#357)

* Add polymorphism to syntax tree and parser

* Add polymorphism to infer types

* Fix pretty printing

* Add new tests and fix old tests

* Fix the comparison between unit and empty tuple

* Report undefined interface errors before checking implemented interfaces

* Add test for implementing multiple interfaces

* Add test for implementing two interfaces with entrypoints of same names and different types

* Add tests for interfaces implementing interfaces

* Draft: Add variance switching

* Revert "Draft: Add variance switching"

This reverts commit 92dc6ac169cfbff447ed59de04994f564876b3fb.

* Add variance switching

* Fix broken tests

* Fix broken abi tests

* Add tests for variance switching

* Fix tests after rebase

* Variance switching for custom datatypes

* Fix dialyzer warning

* Add testing for custom types variance switching

* Make opposite_variance a separate function

* Make is_subtype/4 a separate function

* Fix warning

* Mark tvars as invariant

* Add type_vars_uvar ets table to ets_tables()

* Don't destroy and recreate type errors table when not needed

* Fixes from the reviews

* Use is_list to check if a var is a list

* Compare named args in fun_t

* Test only for covariance and contravariance

* Remove arrows_in_type and use infer_type_vars_variance instead

* Add tests for option and type aliases

* Fix previous commit

* Rename check_implemented_interfaces_recursive to check_implemented_interfaces1

* Make interfaces declare functions from extended interfaces

* Restore test.aes

* Add test for variance switching in records

* Enable variance switching for record types

* Handle builtin types type variables separately

* Add tests for oracles and oracle queries

* Replace compare_types with non-throwing version of unify

* Add the context to unification error

* Test variance switching for bivariant records

* Give clear names to the records in records variance switching test

* Handle comments about polymorphism_variance_switching.aes

* Rename datatypes in custom types variance switching test for readability

* Change the variance of the oracle_query type vars

* Add test for accessing maps with the wrong type

* Default to invariant when the variance of the type vars is unknown

* Rename test files to have common prefix

* Rename functions in variance switching tests for readability

* Fix variance inference

* Eliminate redundant tests

* Test all cases for bivariant

src/aeso_compiler.erl

@@ -238,8 +238,8 @@ insert_init_function(Code, Options) ->
 
 last_contract_indent(Decls) ->
     case lists:last(Decls) of
-        {_, _, _, [Decl | _]} -> aeso_syntax:get_ann(col, Decl, 1) - 1;
-        _                     -> 0
+        {_, _, _, _, [Decl | _]} -> aeso_syntax:get_ann(col, Decl, 1) - 1;
+        _                        -> 0
     end.
 
 -spec to_sophia_value(string(), string(), ok | error | revert, binary()) ->
@@ -338,7 +338,7 @@ decode_calldata(ContractString, FunName, Calldata, Options0) ->
     end.
 
 -dialyzer({nowarn_function, get_decode_type/2}).
-get_decode_type(FunName, [{Contract, Ann, _, Defs}]) when ?IS_CONTRACT_HEAD(Contract) ->
+get_decode_type(FunName, [{Contract, Ann, _, _, Defs}]) when ?IS_CONTRACT_HEAD(Contract) ->
     GetType = fun({letfun, _, {id, _, Name}, Args, Ret, _})               when Name == FunName -> [{Args, Ret}];
                  ({fun_decl, _, {id, _, Name}, {fun_t, _, _, Args, Ret}}) when Name == FunName -> [{Args, Ret}];
                  (_) -> [] end,