Add ui test for ADT

Author: GuillaumeGomez

tests/ui/missing_transmute_annotations.fixed

@@ -53,6 +53,21 @@ unsafe fn foo7() -> i32 {
     bad_transmute!([1u16, 2u16])
 }
 
+#[repr(i32)]
+enum Foo {
+    A = 0,
+}
+
+unsafe fn foo8() -> Foo {
+    std::mem::transmute::<i32, Foo>(0i32)
+    //~^ ERROR: transmute used without annotations
+}
+
+unsafe fn foo9() -> i32 {
+    std::mem::transmute::<Foo, i32>(Foo::A)
+    //~^ ERROR: transmute used without annotations
+}
+
 fn main() {
     let x: _ = unsafe { std::mem::transmute::<[u16; 2], i32>([1u16, 2u16]) };
     //~^ ERROR: transmute used without annotations

tests/ui/missing_transmute_annotations.rs

@@ -53,6 +53,21 @@ unsafe fn foo7() -> i32 {
     bad_transmute!([1u16, 2u16])
 }
 
+#[repr(i32)]
+enum Foo {
+    A = 0,
+}
+
+unsafe fn foo8() -> Foo {
+    std::mem::transmute(0i32)
+    //~^ ERROR: transmute used without annotations
+}
+
+unsafe fn foo9() -> i32 {
+    std::mem::transmute(Foo::A)
+    //~^ ERROR: transmute used without annotations
+}
+
 fn main() {
     let x: _ = unsafe { std::mem::transmute::<_, i32>([1u16, 2u16]) };
     //~^ ERROR: transmute used without annotations

tests/ui/missing_transmute_annotations.stderr

@@ -49,16 +49,28 @@ LL |     local_bad_transmute!([1u16, 2u16])
    = note: this error originates in the macro `local_bad_transmute` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:57:35
+  --> tests/ui/missing_transmute_annotations.rs:62:15
+   |
+LL |     std::mem::transmute(0i32)
+   |               ^^^^^^^^^ help: consider adding missing annotations: `transmute::<i32, Foo>`
+
+error: transmute used without annotations
+  --> tests/ui/missing_transmute_annotations.rs:67:15
+   |
+LL |     std::mem::transmute(Foo::A)
+   |               ^^^^^^^^^ help: consider adding missing annotations: `transmute::<Foo, i32>`
+
+error: transmute used without annotations
+  --> tests/ui/missing_transmute_annotations.rs:72:35
    |
 LL |     let x: _ = unsafe { std::mem::transmute::<_, i32>([1u16, 2u16]) };
    |                                   ^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
 error: transmute used without annotations
-  --> tests/ui/missing_transmute_annotations.rs:60:30
+  --> tests/ui/missing_transmute_annotations.rs:75:30
    |
 LL |         let x: _ = std::mem::transmute::<_, i32>([1u16, 2u16]);
    |                              ^^^^^^^^^^^^^^^^^^^ help: consider adding missing annotations: `transmute::<[u16; 2], i32>`
 
-error: aborting due to 9 previous errors
+error: aborting due to 11 previous errors