1 files changed, 79 insertions, 0 deletions
diff --git a/src/test/ui/lint/lint-exceeding-bitshifts.rs b/src/test/ui/lint/lint-exceeding-bitshifts.rs
new file mode 100644
index 000000000..d8774cb4d
--- /dev/null
+++ b/src/test/ui/lint/lint-exceeding-bitshifts.rs
@@ -0,0 +1,79 @@
+// revisions: noopt opt opt_with_overflow_checks
+//[noopt]compile-flags: -C opt-level=0
+//[opt]compile-flags: -O
+//[opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O
+// build-pass
+// ignore-pass (test emits codegen-time warnings and verifies that they are not errors)
+// normalize-stderr-test "shift left by `(64|32)_usize`, which" -> "shift left by `%BITS%`, which"
+
+#![crate_type="lib"]
+#![warn(arithmetic_overflow, const_err)]
+
+
+pub trait Foo {
+    const N: i32;
+}
+
+impl<T: Foo> Foo for Vec<T> {
+    const N: i32 = T::N << 42; //~ WARN: arithmetic operation will overflow
+}
+
+pub fn foo(x: i32) {
+    let _ = x << 42; //~ WARN: arithmetic operation will overflow
+}
+
+pub fn main() {
+      let n = 1u8 << 7;
+      let n = 1u8 << 8;   //~ WARN: arithmetic operation will overflow
+      let n = 1u16 << 15;
+      let n = 1u16 << 16; //~ WARN: arithmetic operation will overflow
+      let n = 1u32 << 31;
+      let n = 1u32 << 32; //~ WARN: arithmetic operation will overflow
+      let n = 1u64 << 63;
+      let n = 1u64 << 64; //~ WARN: arithmetic operation will overflow
+      let n = 1i8 << 7;
+      let n = 1i8 << 8;   //~ WARN: arithmetic operation will overflow
+      let n = 1i16 << 15;
+      let n = 1i16 << 16; //~ WARN: arithmetic operation will overflow
+      let n = 1i32 << 31;
+      let n = 1i32 << 32; //~ WARN: arithmetic operation will overflow
+      let n = 1i64 << 63;
+      let n = 1i64 << 64; //~ WARN: arithmetic operation will overflow
+
+      let n = 1u8 >> 7;
+      let n = 1u8 >> 8;   //~ WARN: arithmetic operation will overflow
+      let n = 1u16 >> 15;
+      let n = 1u16 >> 16; //~ WARN: arithmetic operation will overflow
+      let n = 1u32 >> 31;
+      let n = 1u32 >> 32; //~ WARN: arithmetic operation will overflow
+      let n = 1u64 >> 63;
+      let n = 1u64 >> 64; //~ WARN: arithmetic operation will overflow
+      let n = 1i8 >> 7;
+      let n = 1i8 >> 8;   //~ WARN: arithmetic operation will overflow
+      let n = 1i16 >> 15;
+      let n = 1i16 >> 16; //~ WARN: arithmetic operation will overflow
+      let n = 1i32 >> 31;
+      let n = 1i32 >> 32; //~ WARN: arithmetic operation will overflow
+      let n = 1i64 >> 63;
+      let n = 1i64 >> 64; //~ WARN: arithmetic operation will overflow
+
+      let n = 1u8;
+      let n = n << 7;
+      let n = n << 8; //~ WARN: arithmetic operation will overflow
+
+      let n = 1u8 << -8; //~ WARN: arithmetic operation will overflow
+
+      let n = 1i8<<(1isize+-1);
+
+      let n = 1u8 << (4+3);
+      let n = 1u8 << (4+4); //~ WARN: arithmetic operation will overflow
+      let n = 1i64 >> [63][0];
+      let n = 1i64 >> [64][0]; //~ WARN: arithmetic operation will overflow
+
+      #[cfg(target_pointer_width = "32")]
+      const BITS: usize = 32;
+      #[cfg(target_pointer_width = "64")]
+      const BITS: usize = 64;
+      let n = 1_isize << BITS; //~ WARN: arithmetic operation will overflow
+      let n = 1_usize << BITS; //~ WARN: arithmetic operation will overflow
+}