Add UB test for int to enum cast

Author: lucic71

tests/ub/enum_out_of_range_cast.cpp

@@ -0,0 +1,9 @@
+// panic
+
+enum Color { RED, GREEN, BLUE };
+
+int main() {
+  int n = 3;
+  Color c = (Color)n;
+  return c == BLUE ? 0 : 1;
+}

tests/ub/out/refcount/enum_out_of_range_cast.rs

@@ -0,0 +1,37 @@
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::cell::RefCell;
+use std::collections::BTreeMap;
+use std::io::prelude::*;
+use std::io::{Read, Seek, Write};
+use std::os::fd::AsFd;
+use std::rc::{Rc, Weak};
+#[derive(Clone, Copy, PartialEq, Debug, Default)]
+enum Color {
+    #[default]
+    RED = 0,
+    GREEN = 1,
+    BLUE = 2,
+}
+impl From<i32> for Color {
+    fn from(n: i32) -> Color {
+        match n {
+            0 => Color::RED,
+            1 => Color::GREEN,
+            2 => Color::BLUE,
+            _ => panic!("invalid Color value: {}", n),
+        }
+    }
+}
+pub fn main() {
+    std::process::exit(main_0());
+}
+fn main_0() -> i32 {
+    let n: Value<i32> = Rc::new(RefCell::new(3));
+    let c: Value<Color> = Rc::new(RefCell::new(Color::from((*n.borrow()) as i32)));
+    return if (((*c.borrow()) as i32) == (Color::BLUE as i32)) {
+        0
+    } else {
+        1
+    };
+}

tests/ub/out/unsafe/enum_out_of_range_cast.rs

@@ -0,0 +1,39 @@
+extern crate libc;
+use libc::*;
+extern crate libcc2rs;
+use libcc2rs::*;
+use std::collections::BTreeMap;
+use std::io::{Read, Seek, Write};
+use std::os::fd::{AsFd, FromRawFd, IntoRawFd};
+use std::rc::Rc;
+#[derive(Clone, Copy, PartialEq, Debug, Default)]
+enum Color {
+    #[default]
+    RED = 0,
+    GREEN = 1,
+    BLUE = 2,
+}
+impl From<i32> for Color {
+    fn from(n: i32) -> Color {
+        match n {
+            0 => Color::RED,
+            1 => Color::GREEN,
+            2 => Color::BLUE,
+            _ => panic!("invalid Color value: {}", n),
+        }
+    }
+}
+pub fn main() {
+    unsafe {
+        std::process::exit(main_0() as i32);
+    }
+}
+unsafe fn main_0() -> i32 {
+    let mut n: i32 = 3;
+    let mut c: Color = Color::from(n as i32);
+    return if ((c as i32) == (Color::BLUE as i32)) {
+        0
+    } else {
+        1
+    };
+}