New upstream version 1.52.1+dfsg1

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

diff --git a/src/tools/clippy/tests/ui/temporary_assignment.rs b/src/tools/clippy/tests/ui/temporary_assignment.rs
new file mode 100644 (file)
index 0000000..b4a9310
--- /dev/null
+++ b/src/tools/clippy/tests/ui/temporary_assignment.rs
@@ -0,0 +1,71 @@
+#![warn(clippy::temporary_assignment)]
+#![allow(const_item_mutation)]
+
+use std::ops::{Deref, DerefMut};
+
+struct TupleStruct(i32);
+
+struct Struct {
+    field: i32,
+}
+
+struct MultiStruct {
+    structure: Struct,
+}
+
+struct Wrapper<'a> {
+    inner: &'a mut Struct,
+}
+
+impl<'a> Deref for Wrapper<'a> {
+    type Target = Struct;
+    fn deref(&self) -> &Struct {
+        self.inner
+    }
+}
+
+impl<'a> DerefMut for Wrapper<'a> {
+    fn deref_mut(&mut self) -> &mut Struct {
+        self.inner
+    }
+}
+
+struct ArrayStruct {
+    array: [i32; 1],
+}
+
+const A: TupleStruct = TupleStruct(1);
+const B: Struct = Struct { field: 1 };
+const C: MultiStruct = MultiStruct {
+    structure: Struct { field: 1 },
+};
+const D: ArrayStruct = ArrayStruct { array: [1] };
+
+fn main() {
+    let mut s = Struct { field: 0 };
+    let mut t = (0, 0);
+
+    Struct { field: 0 }.field = 1;
+    MultiStruct {
+        structure: Struct { field: 0 },
+    }
+    .structure
+    .field = 1;
+    ArrayStruct { array: [0] }.array[0] = 1;
+    (0, 0).0 = 1;
+
+    // no error
+    s.field = 1;
+    t.0 = 1;
+    Wrapper { inner: &mut s }.field = 1;
+    let mut a_mut = TupleStruct(1);
+    a_mut.0 = 2;
+    let mut b_mut = Struct { field: 1 };
+    b_mut.field = 2;
+    let mut c_mut = MultiStruct {
+        structure: Struct { field: 1 },
+    };
+    c_mut.structure.field = 2;
+    let mut d_mut = ArrayStruct { array: [1] };
+    d_mut.array[0] = 2;
+}