message: test: invalid function type with multiple results
diff: using namespace fizzy;
  using namespace fizzy::test;
  +TEST(validation, function_type_invalid_arity)
  +{
  + /* wat2wasm --no-check
  + (type (func (result i32 i32)))
  + */
  + const auto wasm = from_hex("0061736d010000000106016000027f7f");
  + EXPECT_THROW_MESSAGE(parse(wasm), validation_error, "function has more than one result");
  +}
  +
  TEST(validation, imported_function_unknown_type)
  {
  /* wat2wasm --no-check
  