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error[E0277]: `T` is not a tuple
  --> $DIR/builtin-fail.rs:8:23
   |
LL |     assert_is_tuple::<T>();
   |                       ^ the trait `Tuple` is not implemented for `T`
   |
note: required by a bound in `assert_is_tuple`
  --> $DIR/builtin-fail.rs:3:23
   |
LL | fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
   |                       ^^^^^^^^^^^^^^^^^^ required by this bound in `assert_is_tuple`
help: consider restricting type parameter `T`
   |
LL | fn from_param_env<T: std::marker::Tuple>() {
   |                    ++++++++++++++++++++

error[E0277]: `i32` is not a tuple
  --> $DIR/builtin-fail.rs:13:23
   |
LL |     assert_is_tuple::<i32>();
   |                       ^^^ the trait `Tuple` is not implemented for `i32`
   |
note: required by a bound in `assert_is_tuple`
  --> $DIR/builtin-fail.rs:3:23
   |
LL | fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
   |                       ^^^^^^^^^^^^^^^^^^ required by this bound in `assert_is_tuple`

error[E0277]: `i32` is not a tuple
  --> $DIR/builtin-fail.rs:15:24
   |
LL |     assert_is_tuple::<(i32)>();
   |                        ^^^ the trait `Tuple` is not implemented for `i32`
   |
note: required by a bound in `assert_is_tuple`
  --> $DIR/builtin-fail.rs:3:23
   |
LL | fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
   |                       ^^^^^^^^^^^^^^^^^^ required by this bound in `assert_is_tuple`

error[E0277]: `TupleStruct` is not a tuple
  --> $DIR/builtin-fail.rs:17:23
   |
LL |     assert_is_tuple::<TupleStruct>();
   |                       ^^^^^^^^^^^ the trait `Tuple` is not implemented for `TupleStruct`
   |
note: required by a bound in `assert_is_tuple`
  --> $DIR/builtin-fail.rs:3:23
   |
LL | fn assert_is_tuple<T: std::marker::Tuple + ?Sized>() {}
   |                       ^^^^^^^^^^^^^^^^^^ required by this bound in `assert_is_tuple`

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0277`.