diff --git a/build_sysroot/Cargo.lock b/build_sysroot/Cargo.lock
index 3183d7660c6..d26dfd186b9 100644
--- a/build_sysroot/Cargo.lock
+++ b/build_sysroot/Cargo.lock
@@ -51,9 +51,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.54"
+version = "1.0.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bbb73db36c1246e9034e307d0fba23f9a2e251faa47ade70c1bd252220c8311"
+checksum = "b1be3409f94d7bdceeb5f5fac551039d9b3f00e25da7a74fc4d33400a0d96368"
 
 [[package]]
 name = "cfg-if"
diff --git a/example/mini_core.rs b/example/mini_core.rs
index ccca19ccf8c..bc5610855ae 100644
--- a/example/mini_core.rs
+++ b/example/mini_core.rs
@@ -388,6 +388,7 @@ pub enum Option<T> {
 #[lang = "fn_once"]
 #[rustc_paren_sugar]
 pub trait FnOnce<Args> {
+    #[lang = "fn_once_output"]
     type Output;
 
     extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
diff --git a/rust-toolchain b/rust-toolchain
index 3996824011c..87ae49d6620 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2020-06-23
+nightly-2020-06-27
diff --git a/src/abi/mod.rs b/src/abi/mod.rs
index 4bf06a7490a..a70314758d0 100644
--- a/src/abi/mod.rs
+++ b/src/abi/mod.rs
@@ -377,9 +377,8 @@ enum ArgKind<'tcx> {
                     let local_decl = &fx.mir.local_decls[local];
                     //                       v this ! is important
                     let internally_mutable = !val.layout().ty.is_freeze(
-                        fx.tcx,
+                        fx.tcx.at(local_decl.source_info.span),
                         ParamEnv::reveal_all(),
-                        local_decl.source_info.span,
                     );
                     if local_decl.mutability == mir::Mutability::Not && !internally_mutable {
                         // We wont mutate this argument, so it is fine to borrow the backing storage
diff --git a/src/base.rs b/src/base.rs
index a205a0525fb..8d2087b3528 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -219,7 +219,7 @@ fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
                 cleanup: _,
             } => {
                 if !fx.tcx.sess.overflow_checks() {
-                    if let mir::AssertKind::OverflowNeg = *msg {
+                    if let mir::AssertKind::OverflowNeg(_) = *msg {
                         let target = fx.get_block(*target);
                         fx.bcx.ins().jump(target, &[]);
                         continue;
diff --git a/src/constant.rs b/src/constant.rs
index cb797b3a5fe..d4ec9b68ff3 100644
--- a/src/constant.rs
+++ b/src/constant.rs
@@ -219,7 +219,7 @@ fn data_id_for_static(
     let is_mutable = if tcx.is_mutable_static(def_id) {
         true
     } else {
-        !ty.is_freeze(tcx, ParamEnv::reveal_all(), DUMMY_SP)
+        !ty.is_freeze(tcx.at(DUMMY_SP), ParamEnv::reveal_all())
     };
     let align = tcx
         .layout_of(ParamEnv::reveal_all().and(ty))
diff --git a/src/intrinsics/mod.rs b/src/intrinsics/mod.rs
index 32447b7a925..c74ed2d3061 100644
--- a/src/intrinsics/mod.rs
+++ b/src/intrinsics/mod.rs
@@ -816,6 +816,16 @@ fn swap(bcx: &mut FunctionBuilder<'_>, v: Value) -> Value {
             ret.write_cvalue(fx, val);
         };
 
+        ptr_guaranteed_eq, (c a, c b) {
+            let val = crate::num::trans_ptr_binop(fx, BinOp::Eq, a, b);
+            ret.write_cvalue(fx, val);
+        };
+
+        ptr_guaranteed_ne, (c a, c b) {
+            let val = crate::num::trans_ptr_binop(fx, BinOp::Ne, a, b);
+            ret.write_cvalue(fx, val);
+        };
+
         caller_location, () {
             let caller_location = fx.get_caller_location(span);
             ret.write_cvalue(fx, caller_location);