Add ui test for empty fields for omitted_patterns lint

Author: DevinR528

src/test/ui/rfc-2008-non-exhaustive/auxiliary/structs.rs

@@ -31,3 +31,11 @@ pub struct NestedStruct {
     pub foo: u16,
     pub bar: NormalStruct,
 }
+
+#[derive(Default)]
+#[non_exhaustive]
+pub struct MixedVisFields {
+    pub a: u16,
+    pub b: bool,
+    pub(crate) foo: bool,
+}

src/test/ui/rfc-2008-non-exhaustive/reachable-patterns.rs

@@ -10,7 +10,7 @@ use enums::{
     EmptyNonExhaustiveEnum, NestedNonExhaustive, NonExhaustiveEnum, NonExhaustiveSingleVariant,
     VariantNonExhaustive,
 };
-use structs::{FunctionalRecord, NestedStruct, NormalStruct};
+use structs::{FunctionalRecord, MixedVisFields, NestedStruct, NormalStruct};
 
 #[non_exhaustive]
 #[derive(Default)]
@@ -141,6 +141,10 @@ fn main() {
     //~^ some fields are not explicitly listed
     //~^^ some fields are not explicitly listed
 
+    // Ok: this tests https://github.com/rust-lang/rust/issues/89382
+    #[warn(non_exhaustive_omitted_patterns)]
+    let MixedVisFields { a, b, .. } = MixedVisFields::default();
+
     // Ok: because this only has 1 variant
     #[deny(non_exhaustive_omitted_patterns)]
     match NonExhaustiveSingleVariant::A(true) {

src/test/ui/rfc-2008-non-exhaustive/reachable-patterns.stderr

@@ -129,13 +129,13 @@ LL |     #[deny(non_exhaustive_omitted_patterns)]
    = note: the matched value is of type `ErrorKind` and the `non_exhaustive_omitted_patterns` attribute was found
 
 error: some variants are not matched explicitly
-  --> $DIR/reachable-patterns.rs:153:9
+  --> $DIR/reachable-patterns.rs:157:9
    |
 LL |         _ => {}
    |         ^ pattern `A(_)` not covered
    |
 note: the lint level is defined here
-  --> $DIR/reachable-patterns.rs:151:12
+  --> $DIR/reachable-patterns.rs:155:12
    |
 LL |     #[deny(non_exhaustive_omitted_patterns)]
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^