diff --git a/src/librustc_mir/interpret/validation.rs b/src/librustc_mir/interpret/validation.rs
index 878ec3e19111..9a16a4ec1509 100644
--- a/src/librustc_mir/interpret/validation.rs
+++ b/src/librustc_mir/interpret/validation.rs
@@ -56,17 +56,17 @@ impl<'a, 'tcx, M: Machine<'tcx>> EvalContext<'a, 'tcx, M> {
             use regex::Regex;
             lazy_static! {
                 static ref RE: Regex = Regex::new("^(\
-                    std::mem::uninitialized::|\
-                    std::mem::forget::|\
+                    (std|alloc::heap::__core)::mem::uninitialized::|\
+                    (std|alloc::heap::__core)::mem::forget::|\
                     <(std|alloc)::heap::Heap as (std::heap|alloc::allocator)::Alloc>::|\
-                    <std::mem::ManuallyDrop<T>><.*>::new$|\
-                    <std::mem::ManuallyDrop<T> as std::ops::DerefMut><.*>::deref_mut$|\
-                    std::ptr::read::|\
+                    <(std|alloc::heap::__core)::mem::ManuallyDrop<T>><.*>::new$|\
+                    <(std|alloc::heap::__core)::mem::ManuallyDrop<T> as std::ops::DerefMut><.*>::deref_mut$|\
+                    (std|alloc::heap::__core)::ptr::read::|\
                     \
                     <std::sync::Arc<T>><.*>::inner$|\
                     <std::sync::Arc<T>><.*>::drop_slow$|\
                     (std::heap|alloc::allocator)::Layout::for_value::|\
-                    std::mem::(size|align)_of_val::\
+                    (std|alloc::heap::__core)::mem::(size|align)_of_val::\
                 )").unwrap();
             }
             // Now test
diff --git a/tests/compile-fail/deallocate-bad-alignment.rs b/tests/compile-fail/deallocate-bad-alignment.rs
index a0bcffa47d9f..c1ae7477c81a 100644
--- a/tests/compile-fail/deallocate-bad-alignment.rs
+++ b/tests/compile-fail/deallocate-bad-alignment.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate or reallocate using incorrect alignment or size
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();
diff --git a/tests/compile-fail/deallocate-bad-size.rs b/tests/compile-fail/deallocate-bad-size.rs
index d8c4493043db..5577f10736d2 100644
--- a/tests/compile-fail/deallocate-bad-size.rs
+++ b/tests/compile-fail/deallocate-bad-size.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate or reallocate using incorrect alignment or size
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();
diff --git a/tests/compile-fail/deallocate-twice.rs b/tests/compile-fail/deallocate-twice.rs
index fd3cccfd53a9..e11df0eb4147 100644
--- a/tests/compile-fail/deallocate-twice.rs
+++ b/tests/compile-fail/deallocate-twice.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate dangling pointer
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();
diff --git a/tests/compile-fail/reallocate-bad-alignment-2.rs b/tests/compile-fail/reallocate-bad-alignment-2.rs
index 41da885a2c65..cd6214440ff2 100644
--- a/tests/compile-fail/reallocate-bad-alignment-2.rs
+++ b/tests/compile-fail/reallocate-bad-alignment-2.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate or reallocate using incorrect alignment or size
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();
diff --git a/tests/compile-fail/reallocate-bad-alignment.rs b/tests/compile-fail/reallocate-bad-alignment.rs
index be4bc5589c5c..da5fe1d81909 100644
--- a/tests/compile-fail/reallocate-bad-alignment.rs
+++ b/tests/compile-fail/reallocate-bad-alignment.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate or reallocate using incorrect alignment or size
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 2)).unwrap();
diff --git a/tests/compile-fail/reallocate-bad-size.rs b/tests/compile-fail/reallocate-bad-size.rs
index 2e5a64183802..953178742c46 100644
--- a/tests/compile-fail/reallocate-bad-size.rs
+++ b/tests/compile-fail/reallocate-bad-size.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: tried to deallocate or reallocate using incorrect alignment or size
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();
diff --git a/tests/compile-fail/reallocate-dangling.rs b/tests/compile-fail/reallocate-dangling.rs
index 54636b5d2005..6225879a5a2a 100644
--- a/tests/compile-fail/reallocate-dangling.rs
+++ b/tests/compile-fail/reallocate-dangling.rs
@@ -7,7 +7,6 @@ use alloc::allocator::*;
 
 // error-pattern: dangling pointer was dereferenced
 
-use alloc::heap::*;
 fn main() {
     unsafe {
         let x = Heap.alloc(Layout::from_size_align_unchecked(1, 1)).unwrap();