Correctly implement failed tests

core/codegen/tests/ui-fail-stable/from_param.rs

@@ -0,0 +1 @@
+../ui-fail/from_param.rs

core/codegen/tests/ui-fail-stable/from_param.stderr

@@ -0,0 +1,55 @@
+error: named structs are not supported
+ --> tests/ui-fail-stable/from_param.rs:4:1
+  |
+4 | struct Foo1 {
+  | ^^^^^^
+
+error: [note] error occurred while deriving `FromParam`
+ --> tests/ui-fail-stable/from_param.rs:3:10
+  |
+3 | #[derive(FromParam)]
+  |          ^^^^^^^^^
+  |
+  = note: this error originates in the derive macro `FromParam` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: named structs are not supported
+ --> tests/ui-fail-stable/from_param.rs:9:1
+  |
+9 | struct Foo2 {}
+  | ^^^^^^
+
+error: [note] error occurred while deriving `FromParam`
+ --> tests/ui-fail-stable/from_param.rs:8:10
+  |
+8 | #[derive(FromParam)]
+  |          ^^^^^^^^^
+  |
+  = note: this error originates in the derive macro `FromParam` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: Only empty enums are accepted
+  --> tests/ui-fail-stable/from_param.rs:13:6
+   |
+13 |     A(String),
+   |      ^^^^^^^^
+
+error: [note] error occurred while deriving `FromParam`
+  --> tests/ui-fail-stable/from_param.rs:11:10
+   |
+11 | #[derive(FromParam)]
+   |          ^^^^^^^^^
+   |
+   = note: this error originates in the derive macro `FromParam` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: tuple structs are not supported
+  --> tests/ui-fail-stable/from_param.rs:21:1
+   |
+21 | struct Foo5(usize);
+   | ^^^^^^
+
+error: [note] error occurred while deriving `FromParam`
+  --> tests/ui-fail-stable/from_param.rs:20:10
+   |
+20 | #[derive(FromParam)]
+   |          ^^^^^^^^^
+   |
+   = note: this error originates in the derive macro `FromParam` (in Nightly builds, run with -Z macro-backtrace for more info)

core/codegen/tests/ui-fail/from_param.rs

@@ -17,7 +17,7 @@ enum Foo3 {
 #[derive(FromParam)]
 enum Foo4 {}
 
-#[derive(FromForm)]
+#[derive(FromParam)]
 struct Foo5(usize);
 
 fn main() {}