Tweak output for 'add line' suggestion

Author: estebank

tests/ui/crashes/ice-6252.stderr

@@ -6,11 +6,14 @@ LL |     _n: PhantomData,
    |
 help: consider importing one of these items
    |
-LL | use core::marker::PhantomData;
+LL + use core::marker::PhantomData;
+LL | trait TypeVal<T> {
    |
-LL | use serde::__private::PhantomData;
+LL + use serde::__private::PhantomData;
+LL | trait TypeVal<T> {
    |
-LL | use std::marker::PhantomData;
+LL + use std::marker::PhantomData;
+LL | trait TypeVal<T> {
    |
 
 error[E0412]: cannot find type `VAL` in this scope

tests/ui/derivable_impls.stderr

@@ -14,7 +14,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct FooDefault<'a> {
    |
 
 error: this `impl` can be derived
@@ -30,7 +31,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct TupleDefault(bool, i32, u64);
    |
 
 error: this `impl` can be derived
@@ -46,7 +48,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct StrDefault<'a>(&'a str);
    |
 
 error: this `impl` can be derived
@@ -62,7 +65,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct Y(u32);
    |
 
 error: this `impl` can be derived
@@ -78,7 +82,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct WithoutSelfCurly {
    |
 
 error: this `impl` can be derived
@@ -94,7 +99,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | struct WithoutSelfParan(bool);
    |
 
 error: this `impl` can be derived
@@ -110,7 +116,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | pub struct RepeatDefault1 {
    |
 
 error: this `impl` can be derived
@@ -126,7 +133,8 @@ LL | | }
    = help: remove the manual implementation...
 help: ...and instead derive it...
    |
-LL | #[derive(Default)]
+LL + #[derive(Default)]
+LL | pub enum SimpleEnum {
    |
 help: ...and mark the default variant
    |

tests/ui/new_without_default.stderr

@@ -14,6 +14,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl Foo {
    |
 
 error: you should consider adding a `Default` implementation for `Bar`
@@ -31,6 +32,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl Bar {
    |
 
 error: you should consider adding a `Default` implementation for `LtKo<'c>`
@@ -48,6 +50,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl<'c> LtKo<'c> {
    |
 
 error: you should consider adding a `Default` implementation for `NewNotEqualToDerive`
@@ -65,6 +68,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl NewNotEqualToDerive {
    |
 
 error: you should consider adding a `Default` implementation for `FooGenerics<T>`
@@ -82,6 +86,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl<T> FooGenerics<T> {
    |
 
 error: you should consider adding a `Default` implementation for `BarGenerics<T>`
@@ -99,6 +104,7 @@ LL +     fn default() -> Self {
 LL +         Self::new()
 LL +     }
 LL + }
+LL | impl<T: Copy> BarGenerics<T> {
    |
 
 error: you should consider adding a `Default` implementation for `Foo<T>`