Switch ui tests to trybuild

test_suite/tests/ui/conflict/adjacent-tag.stderr

@@ -7,6 +7,3 @@ error: enum tags `conflict` for type and content conflict with each other
 7 | |     B,
 8 | | }
   | |_^
-
-error: aborting due to previous error
-

test_suite/tests/ui/conflict/flatten-newtype-struct.stderr

@@ -3,6 +3,3 @@ error: #[serde(flatten)] cannot be used on newtype structs
   |
 6 | struct Foo(#[serde(flatten)] HashMap<String, String>);
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to previous error
-

test_suite/tests/ui/conflict/flatten-tuple-struct.stderr

@@ -3,6 +3,3 @@ error: #[serde(flatten)] cannot be used on tuple structs
   |
 6 | struct Foo(u32, #[serde(flatten)] HashMap<String, String>);
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to previous error
-

test_suite/tests/ui/conflict/internal-tag-alias.stderr

@@ -9,6 +9,3 @@ error: variant field name `conflict` conflicts with internal tag
 9  | |     },
 10 | | }
    | |_^
-
-error: aborting due to previous error
-

test_suite/tests/ui/conflict/internal-tag.stderr

@@ -9,6 +9,3 @@ error: variant field name `conflict` conflicts with internal tag
 9  | |     },
 10 | | }
    | |_^
-
-error: aborting due to previous error
-