add test cases for rust-lang#9319

Author: J-ZhengLi

tests/ui/derive_partial_eq_without_eq.fixed

@@ -153,7 +153,8 @@ pub enum MissingEqNonExhaustive3 {
     Bar,
 }
 
-mod issue_9413 {
+mod struct_gen {
+    // issue 9413
     pub trait Group {
         type Element: Eq + PartialEq;
     }
@@ -168,6 +169,14 @@ mod issue_9413 {
 
     #[derive(PartialEq, Eq)]
     pub struct Bar<C: Suite>(i32, <C::Group as Group>::Element);
+
+    // issue 9319
+    #[derive(PartialEq, Eq)]
+    //~^ ERROR: you are deriving `PartialEq` and can implement `Eq`
+    pub struct Oof<T: Fn()>(T);
+
+    #[derive(PartialEq, Eq)]
+    pub struct Rab<T: Fn()>(T);
 }
 
 fn main() {}

tests/ui/derive_partial_eq_without_eq.rs

@@ -153,7 +153,8 @@ pub enum MissingEqNonExhaustive3 {
     Bar,
 }
 
-mod issue_9413 {
+mod struct_gen {
+    // issue 9413
     pub trait Group {
         type Element: Eq + PartialEq;
     }
@@ -168,6 +169,14 @@ mod issue_9413 {
 
     #[derive(PartialEq, Eq)]
     pub struct Bar<C: Suite>(i32, <C::Group as Group>::Element);
+
+    // issue 9319
+    #[derive(PartialEq)]
+    //~^ ERROR: you are deriving `PartialEq` and can implement `Eq`
+    pub struct Oof<T: Fn()>(T);
+
+    #[derive(PartialEq, Eq)]
+    pub struct Rab<T: Fn()>(T);
 }
 
 fn main() {}

tests/ui/derive_partial_eq_without_eq.stderr

@@ -68,10 +68,16 @@ LL |     #[derive(PartialEq)]
    |              ^^^^^^^^^ help: consider deriving `Eq` as well: `PartialEq, Eq`
 
 error: you are deriving `PartialEq` and can implement `Eq`
-  --> tests/ui/derive_partial_eq_without_eq.rs:165:14
+  --> tests/ui/derive_partial_eq_without_eq.rs:166:14
    |
 LL |     #[derive(PartialEq)]
    |              ^^^^^^^^^ help: consider deriving `Eq` as well: `PartialEq, Eq`
 
-error: aborting due to 12 previous errors
+error: you are deriving `PartialEq` and can implement `Eq`
+  --> tests/ui/derive_partial_eq_without_eq.rs:174:14
+   |
+LL |     #[derive(PartialEq)]
+   |              ^^^^^^^^^ help: consider deriving `Eq` as well: `PartialEq, Eq`
+
+error: aborting due to 13 previous errors