New upstream version 1.52.1+dfsg1

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

diff --git a/src/tools/clippy/tests/ui/needless_collect.rs b/src/tools/clippy/tests/ui/needless_collect.rs
new file mode 100644 (file)
index 0000000..6ae14f3
--- /dev/null
+++ b/src/tools/clippy/tests/ui/needless_collect.rs
@@ -0,0 +1,21 @@
+// run-rustfix
+
+#![allow(unused, clippy::suspicious_map, clippy::iter_count)]
+
+use std::collections::{BTreeSet, HashMap, HashSet};
+
+#[warn(clippy::needless_collect)]
+#[allow(unused_variables, clippy::iter_cloned_collect, clippy::iter_next_slice)]
+fn main() {
+    let sample = [1; 5];
+    let len = sample.iter().collect::<Vec<_>>().len();
+    if sample.iter().collect::<Vec<_>>().is_empty() {
+        // Empty
+    }
+    sample.iter().cloned().collect::<Vec<_>>().contains(&1);
+    sample.iter().map(|x| (x, x)).collect::<HashMap<_, _>>().len();
+    // Notice the `HashSet`--this should not be linted
+    sample.iter().collect::<HashSet<_>>().len();
+    // Neither should this
+    sample.iter().collect::<BTreeSet<_>>().len();
+}