enable validation for a bunch of more tests

src/librustc_mir/interpret/validation.rs

@@ -126,8 +126,7 @@ impl<'a, 'tcx, M: Machine<'tcx>> EvalContext<'a, 'tcx, M> {
             use regex::Regex;
             lazy_static! {
                 static ref RE: Regex = Regex::new("^(\
-                    (std|alloc::heap::__core)::mem::uninitialized::|\
-                    (std|alloc::heap::__core)::mem::forget::|\
+                    (std|alloc::heap::__core)::mem::(uninitialized|forget)::|\
                     <(std|alloc)::heap::Heap as (std::heap|alloc::allocator)::Alloc>::|\
                     <(std|alloc::heap::__core)::mem::ManuallyDrop<T>><.*>::new$|\
                     <(std|alloc::heap::__core)::mem::ManuallyDrop<T> as std::ops::DerefMut><.*>::deref_mut$|\

tests/compile-fail/panic.rs

@@ -1,5 +1,3 @@
-// FIXME: Probably failing due to https://github.com/solson/miri/issues/296
-// compile-flags: -Zmir-emit-validate=0
 //error-pattern: the evaluated program panicked
 
 fn main() {

tests/compile-fail/zst2.rs

@@ -1,5 +1,3 @@
-// FIXME: Probably failing due to https://github.com/solson/miri/issues/296
-// compile-flags: -Zmir-emit-validate=0
 // error-pattern: the evaluated program panicked
 
 #[derive(Debug)]

tests/compile-fail/zst3.rs

@@ -1,5 +1,3 @@
-// FIXME: Probably failing due to https://github.com/solson/miri/issues/296
-// compile-flags: -Zmir-emit-validate=0
 // error-pattern: the evaluated program panicked
 
 #[derive(Debug)]

tests/run-pass-fullmir/hashmap.rs

@@ -1,5 +1,3 @@
-// FIXME: disable validation until we figure out how to handle <https://github.com/solson/miri/issues/296>.
-// compile-flags: -Zmir-emit-validate=0
 use std::collections::{self, HashMap};
 use std::hash::BuildHasherDefault;
 

tests/run-pass/btreemap.rs

@@ -1,4 +1,4 @@
-// mir validation can't cope with `mem::uninitialized::<SomeEnum>()`
+// mir validation can't cope with `mem::uninitialized()`, so this test fails with validation & full-MIR.
 // compile-flags: -Zmir-emit-validate=0
 
 #[derive(PartialEq, Eq, PartialOrd, Ord)]