Check for repeated argument names to functions

(PT-159592825)

test/aeso_compiler_tests.erl

@@ -191,6 +191,8 @@ failing_contracts() ->
           "  - r' (at line 5, column 10)">>,
         <<"Repeated name x in pattern\n"
           "  x :: x (at line 26, column 7)">>,
+        <<"Repeated argument x to function repeated_arg (at line 44, column 12).">>,
+        <<"Repeated argument y to function repeated_arg (at line 44, column 12).">>,
         <<"No record type with fields y, z (at line 14, column 22)">>,
         <<"The field z is missing when constructing an element of type r2 (at line 15, column 24)">>,
         <<"Record type r2 does not have field y (at line 15, column 22)">>]}

test/contracts/type_errors.aes

@@ -40,3 +40,5 @@ contract Test =
 
   function type_error(r, x) =
     set_x(set_x(x, r), x)
+
+  function repeated_arg(x : int, y, x : string, y : bool) : string = x