From de4ac0c465facfdfd56ce08dc6bb5cfee901561c Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Tue, 11 Jun 2024 13:28:36 +0200
Subject: [PATCH] add const eval bool-to-int cast test

---
 .../ui/consts/const-eval/ub-invalid-values.rs | 11 ++++++++++
 .../const-eval/ub-invalid-values.stderr       | 20 +++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 tests/ui/consts/const-eval/ub-invalid-values.rs
 create mode 100644 tests/ui/consts/const-eval/ub-invalid-values.stderr

diff --git a/tests/ui/consts/const-eval/ub-invalid-values.rs b/tests/ui/consts/const-eval/ub-invalid-values.rs
new file mode 100644
index 0000000000000..1724a88dd3d9a
--- /dev/null
+++ b/tests/ui/consts/const-eval/ub-invalid-values.rs
@@ -0,0 +1,11 @@
+const fn bool_cast(ptr: *const bool) { unsafe {
+    let _val = *ptr as u32; //~ERROR: evaluation of constant value failed
+    //~^ interpreting an invalid 8-bit value as a bool
+}}
+
+const _: () = {
+    let v = 3_u8;
+    bool_cast(&v as *const u8 as *const bool);
+};
+
+fn main() {}
diff --git a/tests/ui/consts/const-eval/ub-invalid-values.stderr b/tests/ui/consts/const-eval/ub-invalid-values.stderr
new file mode 100644
index 0000000000000..edf72f731e5a0
--- /dev/null
+++ b/tests/ui/consts/const-eval/ub-invalid-values.stderr
@@ -0,0 +1,20 @@
+error[E0080]: evaluation of constant value failed
+  --> $DIR/ub-invalid-values.rs:2:16
+   |
+LL |     let _val = *ptr as u32;
+   |                ^^^^^^^^^^^ interpreting an invalid 8-bit value as a bool: 0x03
+   |
+note: inside `bool_cast`
+  --> $DIR/ub-invalid-values.rs:2:16
+   |
+LL |     let _val = *ptr as u32;
+   |                ^^^^^^^^^^^
+note: inside `_`
+  --> $DIR/ub-invalid-values.rs:8:5
+   |
+LL |     bool_cast(&v as *const u8 as *const bool);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0080`.