Auto merge of #67580 - RalfJung:miri-unleash-tests, r=oli-obk

test the unleashed Miri

In particular, test what happens when we try to drop something. Cc https://github.com/rust-lang/const-eval/issues/17

r? @oli-obk

src/test/ui/consts/miri_unleashed/const_refers_to_static.rs

@@ -6,31 +6,31 @@
 use std::sync::atomic::AtomicUsize;
 use std::sync::atomic::Ordering;
 
-const BOO: &usize = { //~ ERROR undefined behavior to use this value
+const REF_INTERIOR_MUT: &usize = { //~ ERROR undefined behavior to use this value
     static FOO: AtomicUsize = AtomicUsize::new(0);
     unsafe { &*(&FOO as *const _ as *const usize) }
     //~^ WARN skipping const checks
 };
 
-const FOO: usize = {
+const MUTATE_INTERIOR_MUT: usize = {
     static FOO: AtomicUsize = AtomicUsize::new(0);
     FOO.fetch_add(1, Ordering::Relaxed) //~ WARN any use of this value will cause an error
     //~^ WARN skipping const checks
     //~| WARN skipping const checks
 };
 
-const BAR: usize = {
+const READ_INTERIOR_MUT: usize = {
     static FOO: AtomicUsize = AtomicUsize::new(0);
     unsafe { *(&FOO as *const _ as *const usize) } //~ WARN any use of this value will cause an err
     //~^ WARN skipping const checks
 };
 
 static mut MUTABLE: u32 = 0;
-const BAD: u32 = unsafe { MUTABLE }; //~ WARN any use of this value will cause an error
+const READ_MUT: u32 = unsafe { MUTABLE }; //~ WARN any use of this value will cause an error
 //~^ WARN skipping const checks
 
 // ok some day perhaps
-const BOO_OK: &usize = { //~ ERROR it is undefined behavior to use this value
+const READ_IMMUT: &usize = { //~ ERROR it is undefined behavior to use this value
     static FOO: usize = 0;
     &FOO
     //~^ WARN skipping const checks

src/test/ui/consts/miri_unleashed/const_refers_to_static.stderr

@@ -23,10 +23,10 @@ LL |     unsafe { *(&FOO as *const _ as *const usize) }
    |                 ^^^
 
 warning: skipping const checks
-  --> $DIR/const_refers_to_static.rs:29:27
+  --> $DIR/const_refers_to_static.rs:29:32
    |
-LL | const BAD: u32 = unsafe { MUTABLE };
-   |                           ^^^^^^^
+LL | const READ_MUT: u32 = unsafe { MUTABLE };
+   |                                ^^^^^^^
 
 warning: skipping const checks
   --> $DIR/const_refers_to_static.rs:35:6
@@ -37,7 +37,7 @@ LL |     &FOO
 error[E0080]: it is undefined behavior to use this value
   --> $DIR/const_refers_to_static.rs:9:1
    |
-LL | / const BOO: &usize = {
+LL | / const REF_INTERIOR_MUT: &usize = {
 LL | |     static FOO: AtomicUsize = AtomicUsize::new(0);
 LL | |     unsafe { &*(&FOO as *const _ as *const usize) }
 LL | |
@@ -49,7 +49,7 @@ LL | | };
 warning: any use of this value will cause an error
   --> $DIR/const_refers_to_static.rs:17:5
    |
-LL | / const FOO: usize = {
+LL | / const MUTATE_INTERIOR_MUT: usize = {
 LL | |     static FOO: AtomicUsize = AtomicUsize::new(0);
 LL | |     FOO.fetch_add(1, Ordering::Relaxed)
    | |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ calling non-const function `std::sync::atomic::AtomicUsize::fetch_add`
@@ -67,7 +67,7 @@ LL | #![warn(const_err)]
 warning: any use of this value will cause an error
   --> $DIR/const_refers_to_static.rs:24:14
    |
-LL | / const BAR: usize = {
+LL | / const READ_INTERIOR_MUT: usize = {
 LL | |     static FOO: AtomicUsize = AtomicUsize::new(0);
 LL | |     unsafe { *(&FOO as *const _ as *const usize) }
    | |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constant accesses static
@@ -76,17 +76,17 @@ LL | | };
    | |__-
 
 warning: any use of this value will cause an error
-  --> $DIR/const_refers_to_static.rs:29:27
+  --> $DIR/const_refers_to_static.rs:29:32
    |
-LL | const BAD: u32 = unsafe { MUTABLE };
-   | --------------------------^^^^^^^---
-   |                           |
-   |                           constant accesses static
+LL | const READ_MUT: u32 = unsafe { MUTABLE };
+   | -------------------------------^^^^^^^---
+   |                                |
+   |                                constant accesses static
 
 error[E0080]: it is undefined behavior to use this value
   --> $DIR/const_refers_to_static.rs:33:1
    |
-LL | / const BOO_OK: &usize = {
+LL | / const READ_IMMUT: &usize = {
 LL | |     static FOO: usize = 0;
 LL | |     &FOO
 LL | |

src/test/ui/consts/miri_unleashed/drop.rs

@@ -0,0 +1,20 @@
+// compile-flags: -Zunleash-the-miri-inside-of-you
+// ignore-x86 FIXME: missing sysroot spans (#53081)
+// error-pattern: calling non-const function `<std::vec::Vec<i32> as std::ops::Drop>::drop`
+#![deny(const_err)]
+
+use std::mem::ManuallyDrop;
+
+fn main() {}
+
+static TEST_OK: () = {
+    let v: Vec<i32> = Vec::new();
+    let _v = ManuallyDrop::new(v);
+};
+
+// Make sure we catch executing bad drop functions.
+// The actual error is tested by the error-pattern above.
+static TEST_BAD: () = {
+    let _v: Vec<i32> = Vec::new();
+    //~^ WARN skipping const check
+};

src/test/ui/consts/miri_unleashed/drop.stderr

@@ -0,0 +1,24 @@
+warning: skipping const checks
+  --> $DIR/drop.rs:18:9
+   |
+LL |     let _v: Vec<i32> = Vec::new();
+   |         ^^
+
+error[E0080]: could not evaluate static initializer
+  --> $SRC_DIR/libcore/ptr/mod.rs:LL:COL
+   |
+LL | / unsafe fn real_drop_in_place<T: ?Sized>(to_drop: &mut T) {
+LL | |     // Code here does not matter - this is replaced by the
+LL | |     // real drop glue by the compiler.
+LL | |     real_drop_in_place(to_drop)
+LL | | }
+   | |_^ calling non-const function `<std::vec::Vec<i32> as std::ops::Drop>::drop`
+   | 
+  ::: $DIR/drop.rs:20:1
+   |
+LL |   };
+   |   - inside call to `std::ptr::real_drop_in_place::<std::vec::Vec<i32>> - shim(Some(std::vec::Vec<i32>))` at $DIR/drop.rs:20:1
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0080`.