Merge pull request rust-lang#301 from RalfJung/mir-validate

More validation tests

Author: RalfJung

.travis.yml

@@ -10,6 +10,7 @@ before_script:
 - cargo install xargo
 - export RUST_SYSROOT=$HOME/rust
 script:
+- set -e
 - |
   # get ourselves a MIR-ful libstd
   xargo/build.sh

tests/compile-fail/validation_buggy_as_mut_slice.rs

@@ -0,0 +1,20 @@
+#![allow(unused_variables)]
+
+// For some reason, the error location is different when using fullmir
+// error-pattern: in conflict with lock WriteLock
+
+mod safe {
+    use std::slice::from_raw_parts_mut;
+
+    pub fn as_mut_slice<T>(self_: &Vec<T>) -> &mut [T] {
+        unsafe {
+            from_raw_parts_mut(self_.as_ptr() as *mut T, self_.len())
+        }
+    }
+}
+
+fn main() {
+    let v = vec![0,1,2];
+    let v1_ = safe::as_mut_slice(&v);
+    let v2_ = safe::as_mut_slice(&v);
+}

tests/run-pass/validation_lifetime_resolution.rs

@@ -0,0 +1,30 @@
+trait Id {
+    type Out;
+
+    fn id(self) -> Self::Out;
+}
+
+impl<'a> Id for &'a mut i32 {
+    type Out = &'a mut i32;
+
+    fn id(self) -> Self { self }
+}
+
+impl<'a> Id for &'a mut u32 {
+    type Out = &'a mut u32;
+
+    fn id(self) -> Self { self }
+}
+
+fn foo<T>(mut x: T) where for<'a> &'a mut T: Id
+{
+    let x = &mut x;
+    let _y = x.id();
+    // Inspecting the trace should show that _y has a type involving a local lifetime, when it gets validated.
+    // Unfortunately, there doesn't seem to be a way to actually have a test fail if it does not have the right
+    // type.  Currently, this is NOT working correctly; see <https://github.com/solson/miri/issues/298>.
+}
+
+fn main() {
+    foo(3)
+}