Update upstream source from tag 'upstream/1.52.1+dfsg1'

[rustc.git] / src / tools / clippy / tests / ui / ref_option_ref.rs

diff --git a/src/tools/clippy/tests/ui/ref_option_ref.rs b/src/tools/clippy/tests/ui/ref_option_ref.rs
new file mode 100644 (file)
index 0000000..b2c275d
--- /dev/null
+++ b/src/tools/clippy/tests/ui/ref_option_ref.rs
@@ -0,0 +1,47 @@
+#![allow(unused)]
+#![warn(clippy::ref_option_ref)]
+
+// This lint is not tagged as run-rustfix because automatically
+// changing the type of a variable would also means changing
+// all usages of this variable to match and This is not handled
+// by this lint.
+
+static THRESHOLD: i32 = 10;
+static REF_THRESHOLD: &Option<&i32> = &Some(&THRESHOLD);
+const CONST_THRESHOLD: &i32 = &10;
+const REF_CONST: &Option<&i32> = &Some(&CONST_THRESHOLD);
+
+type RefOptRefU32<'a> = &'a Option<&'a u32>;
+type RefOptRef<'a, T> = &'a Option<&'a T>;
+
+fn foo(data: &Option<&u32>) {}
+
+fn bar(data: &u32) -> &Option<&u32> {
+    &None
+}
+
+struct StructRef<'a> {
+    data: &'a Option<&'a u32>,
+}
+
+struct StructTupleRef<'a>(u32, &'a Option<&'a u32>);
+
+enum EnumRef<'a> {
+    Variant1(u32),
+    Variant2(&'a Option<&'a u32>),
+}
+
+trait RefOptTrait {
+    type A;
+    fn foo(&self, _: Self::A);
+}
+
+impl RefOptTrait for u32 {
+    type A = &'static Option<&'static Self>;
+
+    fn foo(&self, _: Self::A) {}
+}
+
+fn main() {
+    let x: &Option<&u32> = &None;
+}