Add cases to where-allowed.rs

Author: chrisvittal

src/test/compile-fail/impl-trait/where-allowed.rs

@@ -48,7 +48,6 @@ fn in_dyn_Fn_parameter_in_parameters(_: &dyn Fn(impl Debug)) { panic!() }
 // Disallowed
 fn in_dyn_Fn_return_in_parameters(_: &dyn Fn() -> impl Debug) { panic!() }
 //~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
-// FIXME -- no error currently
 
 // Disallowed
 fn in_dyn_Fn_parameter_in_return() -> &'static dyn Fn(impl Debug) { panic!() }
@@ -57,7 +56,6 @@ fn in_dyn_Fn_parameter_in_return() -> &'static dyn Fn(impl Debug) { panic!() }
 // Disallowed
 fn in_dyn_Fn_return_in_return() -> &'static dyn Fn() -> impl Debug { panic!() }
 //~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
-// FIXME -- no error currently
 
 // Disallowed
 fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
@@ -66,7 +64,6 @@ fn in_impl_Fn_parameter_in_parameters(_: &impl Fn(impl Debug)) { panic!() }
 // Disallowed
 fn in_impl_Fn_return_in_parameters(_: &impl Fn() -> impl Debug) { panic!() }
 //~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
-// FIXME -- no error currently
 
 // Disallowed
 fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
@@ -75,7 +72,15 @@ fn in_impl_Fn_parameter_in_return() -> &'static impl Fn(impl Debug) { panic!() }
 // Disallowed
 fn in_impl_Fn_return_in_return() -> &'static impl Fn() -> impl Debug { panic!() }
 //~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
-// FIXME -- no error currently
+
+// Disallowed
+fn in_Fn_parameter_in_generics<F: Fn(impl Debug)> (_: F) { panic!() }
+//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
+
+// Disallowed
+fn in_Fn_return_in_generics<F: Fn() -> impl Debug> (_: F) { panic!() }
+//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
+
 
 // Allowed
 fn in_impl_Trait_in_parameters(_: impl Iterator<Item = impl Iterator>) { panic!() }