Place compile-fail expected errors on their own line

test_suite/tests/compile-fail/identifier/both.rs

@@ -9,8 +9,9 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: `field_identifier` and `variant_identifier` cannot both be set
+#[derive(Deserialize)]
 #[serde(field_identifier, variant_identifier)]
+//~^^ ERROR: `field_identifier` and `variant_identifier` cannot both be set
 enum F {
     A,
     B,

test_suite/tests/compile-fail/identifier/field_struct.rs

@@ -9,8 +9,9 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: `field_identifier` can only be used on an enum
+#[derive(Deserialize)]
 #[serde(field_identifier)]
+//~^^ ERROR: `field_identifier` can only be used on an enum
 struct S;
 
 fn main() {}

test_suite/tests/compile-fail/identifier/field_tuple.rs

@@ -9,11 +9,12 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: field_identifier may only contain unit variants
+#[derive(Deserialize)]
 #[serde(field_identifier)]
 enum F {
     A,
     B(u8, u8),
+    //~^^^^^ ERROR: field_identifier may only contain unit variants
 }
 
 fn main() {}

test_suite/tests/compile-fail/identifier/newtype_not_last.rs

@@ -9,11 +9,12 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: `Other` must be the last variant
+#[derive(Deserialize)]
 #[serde(field_identifier)]
 enum F {
     A,
     Other(String),
+    //~^^^^^ ERROR: `Other` must be the last variant
     B,
 }
 

test_suite/tests/compile-fail/identifier/not_identifier.rs

@@ -9,10 +9,11 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: #[serde(other)] may only be used inside a field_identifier
+#[derive(Deserialize)]
 enum F {
     A,
     #[serde(other)]
+    //~^^^^ ERROR: #[serde(other)] may only be used inside a field_identifier
     B,
 }
 

test_suite/tests/compile-fail/identifier/not_unit.rs

@@ -9,11 +9,12 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: #[serde(other)] must be on a unit variant
+#[derive(Deserialize)]
 #[serde(field_identifier)]
 enum F {
     A,
     #[serde(other)]
+    //~^^^^^ ERROR: #[serde(other)] must be on a unit variant
     Other(u8, u8),
 }
 

test_suite/tests/compile-fail/identifier/other_not_last.rs

@@ -9,11 +9,12 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: #[serde(other)] must be the last variant
+#[derive(Deserialize)]
 #[serde(field_identifier)]
 enum F {
     A,
     #[serde(other)]
+    //~^^^^^ ERROR: #[serde(other)] must be the last variant
     Other,
     B,
 }

test_suite/tests/compile-fail/identifier/serialize.rs

@@ -9,8 +9,9 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Serialize)] //~ ERROR: 12:10: 12:19: field identifiers cannot be serialized
+#[derive(Serialize)]
 #[serde(field_identifier)]
+//~^^ ERROR: field identifiers cannot be serialized
 enum F {
     A,
     B,

test_suite/tests/compile-fail/identifier/variant_struct.rs

@@ -9,8 +9,9 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: `variant_identifier` can only be used on an enum
+#[derive(Deserialize)]
 #[serde(variant_identifier)]
+//~^^ ERROR: `variant_identifier` can only be used on an enum
 struct S;
 
 fn main() {}

test_suite/tests/compile-fail/identifier/variant_tuple.rs

@@ -9,11 +9,12 @@
 #[macro_use]
 extern crate serde_derive;
 
-#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: variant_identifier may only contain unit variants
+#[derive(Deserialize)]
 #[serde(variant_identifier)]
 enum F {
     A,
     B(u8, u8),
+    //~^^^^^ ERROR: variant_identifier may only contain unit variants
 }
 
 fn main() {}