Framework and tests for code generation (icode/fcode) errors

test/contracts/code_errors/bad_aens_resolve.aes

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+contract BadAENSresolve =
+
+  type t('a) = option(list('a))
+
+  function fail() : t(int) =
+    AENS.resolve("foo.aet", "whatever")
+
+  entrypoint main() = ()
+

test/contracts/code_errors/higher_order_compare.aes

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+contract HigherOrderCompare =
+
+  function cmp(x : int => int, y) : bool =
+    x < y
+
+  entrypoint test() =
+    let f(x) = (y) => x + y
+    cmp(f(1), f(2))

test/contracts/code_errors/last_declaration_must_be_contract.aes

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+namespace LastDeclarationIsNotAContract =
+  function add(x, y) = x + y

test/contracts/code_errors/missing_init_function.aes

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+contract MissingInitFunction =
+  type state = int * int
+

test/contracts/code_errors/parameterised_event.aes

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+contract ParameterisedEvent =
+
+  datatype event('a) = Event(int)
+

test/contracts/code_errors/parameterised_state.aes

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+contract ParameterisedState =
+
+  type state('a) = list('a)
+

test/contracts/code_errors/polymorphic_aens_resolve.aes

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+contract PolymorphicAENSresolve =
+
+  function fail() : option('a) =
+    AENS.resolve("foo.aet", "whatever")
+
+  entrypoint main() = ()
+

test/contracts/code_errors/polymorphic_compare.aes

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+contract PolymorphicCompare =
+
+  function cmp(x : 'a, y : 'a) : bool =
+    x == y
+
+  entrypoint test() =
+    cmp(4, 6) && cmp(true, false)

test/contracts/code_errors/polymorphic_entrypoint.aes

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+contract PolymorphicEntrypoint =
+  entrypoint id(x : 'a) : 'a = x
+