Place compile-fail expected errors on their own line

test_suite/tests/compile-fail/remote/bad_getter.rs

@@ -15,10 +15,11 @@ mod remote {
     }
 }
 
-#[derive(Serialize)] //~ ERROR: 18:10: 18:19: failed to parse path: "~~~"
+#[derive(Serialize)]
 #[serde(remote = "remote::S")]
 struct S {
     #[serde(getter = "~~~")]
+    //~^^^^ ERROR: failed to parse path: "~~~"
     a: u8,
 }
 

test_suite/tests/compile-fail/remote/bad_remote.rs

@@ -15,8 +15,9 @@ mod remote {
     }
 }
 
-#[derive(Serialize)] //~ ERROR: 18:10: 18:19: failed to parse path: "~~~"
+#[derive(Serialize)]
 #[serde(remote = "~~~")]
+//~^^ ERROR: failed to parse path: "~~~"
 struct S {
     a: u8,
 }

test_suite/tests/compile-fail/remote/enum_getter.rs

@@ -15,11 +15,12 @@ mod remote {
     }
 }
 
-#[derive(Serialize)] //~ ERROR: 18:10: 18:19: #[serde(getter = "...")] is not allowed in an enum
+#[derive(Serialize)]
 #[serde(remote = "remote::E")]
 pub enum E {
     A {
         #[serde(getter = "get_a")]
+        //~^^^^^ ERROR: #[serde(getter = "...")] is not allowed in an enum
         a: u8,
     }
 }

test_suite/tests/compile-fail/remote/missing_field.rs

@@ -19,7 +19,8 @@ mod remote {
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "remote::S")]
 struct S {
-    a: u8, //~^^^ ERROR: missing field `b` in initializer of `remote::S`
+    a: u8,
+    //~^^^^ ERROR: missing field `b` in initializer of `remote::S`
 }
 
 fn main() {}

test_suite/tests/compile-fail/remote/nonremote_getter.rs

@@ -9,9 +9,10 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Serialize)] //~ ERROR: 12:10: 12:19: #[serde(getter = "...")] can only be used in structs that have #[serde(remote = "...")]
+#[derive(Serialize)]
 struct S {
     #[serde(getter = "S::get")]
+    //~^^^ ERROR: #[serde(getter = "...")] can only be used in structs that have #[serde(remote = "...")]
     a: u8,
 }
 

test_suite/tests/compile-fail/remote/unknown_field.rs

@@ -19,7 +19,8 @@ mod remote {
 #[serde(remote = "remote::S")]
 struct S {
     //~^^^ ERROR: struct `remote::S` has no field named `b`
-    b: u8, //~^^^^ ERROR: no field `b` on type `&remote::S`
+    b: u8,
+    //~^^^^^ ERROR: no field `b` on type `&remote::S`
 }
 
 fn main() {}

test_suite/tests/compile-fail/remote/wrong_de.rs

@@ -13,8 +13,10 @@ mod remote {
     pub struct S(pub u16);
 }
 
-#[derive(Deserialize)] //~ ERROR: mismatched types
+#[derive(Deserialize)]
 #[serde(remote = "remote::S")]
-struct S(u8); //~^^ expected u16, found u8
+struct S(u8);
+//~^^^ ERROR: mismatched types
+//~^^^^ expected u16, found u8
 
 fn main() {}

test_suite/tests/compile-fail/remote/wrong_getter.rs

@@ -21,11 +21,13 @@ mod remote {
     }
 }
 
-#[derive(Serialize)] //~ ERROR: mismatched types
+#[derive(Serialize)]
 #[serde(remote = "remote::S")]
 struct S {
     #[serde(getter = "remote::S::get")]
-    a: u8, //~^^^^ expected u8, found u16
+    //~^^^^ ERROR: mismatched types
+    a: u8,
+    //~^^^^^^ expected u8, found u16
 }
 
 fn main() {}

test_suite/tests/compile-fail/remote/wrong_ser.rs

@@ -15,10 +15,12 @@ mod remote {
     }
 }
 
-#[derive(Serialize)] //~ ERROR: mismatched types
+#[derive(Serialize)]
 #[serde(remote = "remote::S")]
 struct S {
-    a: u8, //~^^^ expected u8, found u16
+    a: u8,
+    //~^^^^ ERROR: mismatched types
+    //~^^^^^ expected u8, found u16
 }
 
 fn main() {}