diff --git a/benches/helpers/miri_helper.rs b/benches/helpers/miri_helper.rs
index c8ae22e1ace..cdd1412204f 100644
--- a/benches/helpers/miri_helper.rs
+++ b/benches/helpers/miri_helper.rs
@@ -4,8 +4,9 @@ extern crate rustc;
 extern crate rustc_driver;
 extern crate test;
 
-use self::miri::eval_main;
+use self::miri::{eval_main, run_mir_passes};
 use self::rustc::session::Session;
+use self::rustc::mir::mir_map::MirMap;
 use self::rustc_driver::{driver, CompilerCalls, Compilation};
 use std::cell::RefCell;
 use std::rc::Rc;
@@ -55,7 +56,9 @@ impl<'a> CompilerCalls<'a> for MiriCompilerCalls<'a> {
             let (node_id, _) = state.session.entry_fn.borrow()
                 .expect("no main or start function found");
 
-            bencher.borrow_mut().iter(|| { eval_main(tcx, mir_map, node_id); });
+            let mut mir_map = MirMap { map: mir_map.map.clone() };
+            run_mir_passes(tcx, &mut mir_map);
+            bencher.borrow_mut().iter(|| { eval_main(tcx, &mir_map, node_id); });
 
             state.session.abort_if_errors();
         });
diff --git a/src/bin/miri.rs b/src/bin/miri.rs
index 6a9ad5ce838..4340729d7e0 100644
--- a/src/bin/miri.rs
+++ b/src/bin/miri.rs
@@ -9,8 +9,9 @@ extern crate log_settings;
 extern crate syntax;
 #[macro_use] extern crate log;
 
-use miri::eval_main;
+use miri::{eval_main, run_mir_passes};
 use rustc::session::Session;
+use rustc::mir::mir_map::MirMap;
 use rustc_driver::{driver, CompilerCalls, Compilation};
 
 struct MiriCompilerCalls;
@@ -31,7 +32,10 @@ impl<'a> CompilerCalls<'a> for MiriCompilerCalls {
             let mir_map = state.mir_map.unwrap();
             let (node_id, _) = state.session.entry_fn.borrow()
                 .expect("no main or start function found");
-            eval_main(tcx, mir_map, node_id);
+
+            let mut mir_map = MirMap { map: mir_map.map.clone() };
+            run_mir_passes(tcx, &mut mir_map);
+            eval_main(tcx, &mir_map, node_id);
 
             state.session.abort_if_errors();
         });
diff --git a/src/interpreter/mod.rs b/src/interpreter/mod.rs
index dd352cc2410..a572c9b2c70 100644
--- a/src/interpreter/mod.rs
+++ b/src/interpreter/mod.rs
@@ -980,6 +980,25 @@ fn report(tcx: TyCtxt, ecx: &EvalContext, e: EvalError) {
     err.emit();
 }
 
+pub fn run_mir_passes<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, mir_map: &mut MirMap<'tcx>) {
+    let mut passes = ::rustc::mir::transform::Passes::new();
+    passes.push_hook(Box::new(::rustc_mir::transform::dump_mir::DumpMir));
+    passes.push_pass(Box::new(::rustc_mir::transform::no_landing_pads::NoLandingPads));
+    passes.push_pass(Box::new(::rustc_mir::transform::simplify_cfg::SimplifyCfg::new("no-landing-pads")));
+
+    passes.push_pass(Box::new(::rustc_mir::transform::erase_regions::EraseRegions));
+
+    passes.push_pass(Box::new(::rustc_mir::transform::add_call_guards::AddCallGuards));
+    passes.push_pass(Box::new(::rustc_borrowck::ElaborateDrops));
+    passes.push_pass(Box::new(::rustc_mir::transform::no_landing_pads::NoLandingPads));
+    passes.push_pass(Box::new(::rustc_mir::transform::simplify_cfg::SimplifyCfg::new("elaborate-drops")));
+
+    passes.push_pass(Box::new(::rustc_mir::transform::add_call_guards::AddCallGuards));
+    passes.push_pass(Box::new(::rustc_mir::transform::dump_mir::Marker("PreMiri")));
+
+    passes.run_passes(tcx, mir_map);
+}
+
 // TODO(solson): Upstream these methods into rustc::ty::layout.
 
 trait IntegerExt {
diff --git a/src/lib.rs b/src/lib.rs
index 83a1aeec68b..46bca86e5c5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,6 +9,7 @@
 
 // From rustc.
 #[macro_use] extern crate rustc;
+extern crate rustc_borrowck;
 extern crate rustc_data_structures;
 extern crate rustc_mir;
 extern crate rustc_trans;
@@ -35,6 +36,7 @@ pub use interpreter::{
     EvalContext,
     Frame,
     eval_main,
+    run_mir_passes,
 };
 
 pub use memory::{
diff --git a/tests/compile-fail/execute_memory.rs b/tests/compile-fail/execute_memory.rs
index 413c6602114..054f91b3cf9 100644
--- a/tests/compile-fail/execute_memory.rs
+++ b/tests/compile-fail/execute_memory.rs
@@ -1,8 +1,8 @@
 #![feature(box_syntax)]
 
-fn main() {
-    //FIXME: this span is wrong
-    let x = box 42; //~ ERROR: tried to treat a memory pointer as a function pointer
+// FIXME: This span is wrong.
+fn main() { //~ ERROR: tried to treat a memory pointer as a function pointer
+    let x = box 42;
     unsafe {
         let f = std::mem::transmute::<Box<i32>, fn()>(x);
         f()
diff --git a/tests/compile-fail/out_of_bounds_read.rs b/tests/compile-fail/out_of_bounds_read.rs
index 3e9e87cdc6c..fef6ff66c30 100644
--- a/tests/compile-fail/out_of_bounds_read.rs
+++ b/tests/compile-fail/out_of_bounds_read.rs
@@ -1,5 +1,5 @@
 fn main() {
     let v: Vec<u8> = vec![1, 2];
-    let x = unsafe { *v.get_unchecked(5) }; //~ ERROR: memory access of 5..6 outside bounds of allocation 29 which has size 2
+    let x = unsafe { *v.get_unchecked(5) }; //~ ERROR: memory access of 5..6 outside bounds of allocation 31 which has size 2
     panic!("this should never print: {}", x);
 }