error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions.
  --> $DIR/feature-gate-default_type_parameter_fallback.rs:3:8
   |
LL | fn avg<T=i32>(_: T) {}
   |        ^
   |
   = note: `#[deny(invalid_type_param_default)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>

error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions.
  --> $DIR/feature-gate-default_type_parameter_fallback.rs:8:6
   |
LL | impl<T=i32> S<T> {}
   |      ^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>

error: aborting due to 2 previous errors