Update ui tests to 2018 edition

test_suite/tests/ui/precondition/deserialize_de_lifetime.rs

@@ -1,5 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
+use serde_derive::Deserialize;
 
 #[derive(Deserialize)]
 struct S<'de> {

test_suite/tests/ui/precondition/deserialize_de_lifetime.stderr

@@ -1,7 +1,7 @@
 error: cannot deserialize when there is a lifetime parameter called 'de
- --> $DIR/deserialize_de_lifetime.rs:5:10
+ --> $DIR/deserialize_de_lifetime.rs:4:10
   |
-5 | struct S<'de> {
+4 | struct S<'de> {
   |          ^^^
 
 error: aborting due to previous error

test_suite/tests/ui/precondition/deserialize_dst.rs

@@ -1,5 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
+use serde_derive::Deserialize;
 
 #[derive(Deserialize)]
 struct S {

test_suite/tests/ui/precondition/deserialize_dst.stderr

@@ -1,10 +1,10 @@
 error: cannot deserialize a dynamically sized struct
- --> $DIR/deserialize_dst.rs:5:1
+ --> $DIR/deserialize_dst.rs:4:1
   |
-5 | / struct S {
-6 | |     string: String,
-7 | |     slice: [u8],
-8 | | }
+4 | / struct S {
+5 | |     string: String,
+6 | |     slice: [u8],
+7 | | }
   | |_^
 
 error: aborting due to previous error

test_suite/tests/ui/precondition/serialize_field_identifier.rs

@@ -1,5 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
+use serde_derive::Serialize;
 
 #[derive(Serialize)]
 #[serde(field_identifier)]

test_suite/tests/ui/precondition/serialize_field_identifier.stderr

@@ -1,11 +1,11 @@
 error: field identifiers cannot be serialized
- --> $DIR/serialize_field_identifier.rs:5:1
+ --> $DIR/serialize_field_identifier.rs:4:1
   |
-5 | / #[serde(field_identifier)]
-6 | | enum F {
-7 | |     A,
-8 | |     B,
-9 | | }
+4 | / #[serde(field_identifier)]
+5 | | enum F {
+6 | |     A,
+7 | |     B,
+8 | | }
   | |_^
 
 error: aborting due to previous error

test_suite/tests/ui/precondition/serialize_variant_identifier.rs

@@ -1,5 +1,4 @@
-#[macro_use]
-extern crate serde_derive;
+use serde_derive::Serialize;
 
 #[derive(Serialize)]
 #[serde(variant_identifier)]

test_suite/tests/ui/precondition/serialize_variant_identifier.stderr

@@ -1,11 +1,11 @@
 error: variant identifiers cannot be serialized
- --> $DIR/serialize_variant_identifier.rs:5:1
+ --> $DIR/serialize_variant_identifier.rs:4:1
   |
-5 | / #[serde(variant_identifier)]
-6 | | enum F {
-7 | |     A,
-8 | |     B,
-9 | | }
+4 | / #[serde(variant_identifier)]
+5 | | enum F {
+6 | |     A,
+7 | |     B,
+8 | | }
   | |_^
 
 error: aborting due to previous error