diff --git a/tests/ui/autodiff/autodiff_illegal.rs b/tests/ui/autodiff/autodiff_illegal.rs
index a53b6d5e5898..6bb384cc87e8 100644
--- a/tests/ui/autodiff/autodiff_illegal.rs
+++ b/tests/ui/autodiff/autodiff_illegal.rs
@@ -110,15 +110,6 @@ fn f14(x: f32) -> Foo {
 
 type MyFloat = f32;
 
-// We would like to support type alias to f32/f64 in argument type in the future,
-// but that requires us to implement our checks at a later stage
-// like THIR which has type information available.
-#[autodiff_reverse(df15, Active, Active)]
-fn f15(x: MyFloat) -> f32 {
-    //~^^ ERROR failed to resolve: use of undeclared type `MyFloat` [E0433]
-    unimplemented!()
-}
-
 // We would like to support type alias to f32/f64 in return type in the future
 #[autodiff_reverse(df16, Active, Active)]
 fn f16(x: f32) -> MyFloat {
@@ -136,13 +127,6 @@ fn f17(x: f64) -> F64Trans {
     unimplemented!()
 }
 
-// We would like to support `#[repr(transparent)]` f32/f64 wrapper in argument type in the future
-#[autodiff_reverse(df18, Active, Active)]
-fn f18(x: F64Trans) -> f64 {
-    //~^^ ERROR failed to resolve: use of undeclared type `F64Trans` [E0433]
-    unimplemented!()
-}
-
 // Invalid return activity
 #[autodiff_forward(df19, Dual, Active)]
 fn f19(x: f32) -> f32 {
@@ -163,11 +147,4 @@ fn f21(x: f32) -> f32 {
     unimplemented!()
 }
 
-struct DoesNotImplDefault;
-#[autodiff_forward(df22, Dual)]
-pub fn f22() -> DoesNotImplDefault {
-    //~^^ ERROR the function or associated item `default` exists for tuple `(DoesNotImplDefault, DoesNotImplDefault)`, but its trait bounds were not satisfied
-    unimplemented!()
-}
-
 fn main() {}
diff --git a/tests/ui/autodiff/autodiff_illegal.stderr b/tests/ui/autodiff/autodiff_illegal.stderr
index ad6f10af4678..848ae1155e9c 100644
--- a/tests/ui/autodiff/autodiff_illegal.stderr
+++ b/tests/ui/autodiff/autodiff_illegal.stderr
@@ -107,53 +107,24 @@ LL | #[autodiff_reverse(df13, Reverse)]
    |                          ^^^^^^^
 
 error: invalid return activity Active in Forward Mode
-  --> $DIR/autodiff_illegal.rs:147:1
+  --> $DIR/autodiff_illegal.rs:131:1
    |
 LL | #[autodiff_forward(df19, Dual, Active)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: invalid return activity Dual in Reverse Mode
-  --> $DIR/autodiff_illegal.rs:153:1
+  --> $DIR/autodiff_illegal.rs:137:1
    |
 LL | #[autodiff_reverse(df20, Active, Dual)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: invalid return activity Duplicated in Reverse Mode
-  --> $DIR/autodiff_illegal.rs:160:1
+  --> $DIR/autodiff_illegal.rs:144:1
    |
 LL | #[autodiff_reverse(df21, Active, Duplicated)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0433]: failed to resolve: use of undeclared type `MyFloat`
-  --> $DIR/autodiff_illegal.rs:116:1
-   |
-LL | #[autodiff_reverse(df15, Active, Active)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared type `MyFloat`
+error: aborting due to 18 previous errors
 
-error[E0433]: failed to resolve: use of undeclared type `F64Trans`
-  --> $DIR/autodiff_illegal.rs:140:1
-   |
-LL | #[autodiff_reverse(df18, Active, Active)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared type `F64Trans`
-
-error[E0599]: the function or associated item `default` exists for tuple `(DoesNotImplDefault, DoesNotImplDefault)`, but its trait bounds were not satisfied
-  --> $DIR/autodiff_illegal.rs:167:1
-   |
-LL | struct DoesNotImplDefault;
-   | ------------------------- doesn't satisfy `DoesNotImplDefault: Default`
-LL | #[autodiff_forward(df22, Dual)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function or associated item cannot be called on `(DoesNotImplDefault, DoesNotImplDefault)` due to unsatisfied trait bounds
-   |
-   = note: the following trait bounds were not satisfied:
-           `DoesNotImplDefault: Default`
-           which is required by `(DoesNotImplDefault, DoesNotImplDefault): Default`
-help: consider annotating `DoesNotImplDefault` with `#[derive(Default)]`
-   |
-LL + #[derive(Default)]
-LL | struct DoesNotImplDefault;
-   |
-
-error: aborting due to 21 previous errors
-
-Some errors have detailed explanations: E0428, E0433, E0599, E0658.
+Some errors have detailed explanations: E0428, E0658.
 For more information about an error, try `rustc --explain E0428`.