diff --git a/src/librustc_codegen_llvm/abi.rs b/src/librustc_codegen_llvm/abi.rs
index b417f552f7d..9e9467e3645 100644
--- a/src/librustc_codegen_llvm/abi.rs
+++ b/src/librustc_codegen_llvm/abi.rs
@@ -172,7 +172,7 @@ pub trait ArgTypeExt<'ll, 'tcx> {
         &self,
         bx: &Builder<'_, 'll, 'tcx>,
         idx: &mut usize,
-       dst: PlaceRef<'tcx, &'ll Value>,
+        dst: PlaceRef<'tcx, &'ll Value>,
     );
 }
 
diff --git a/src/librustc_codegen_llvm/builder.rs b/src/librustc_codegen_llvm/builder.rs
index 9db4015013e..927ad8aecd8 100644
--- a/src/librustc_codegen_llvm/builder.rs
+++ b/src/librustc_codegen_llvm/builder.rs
@@ -26,12 +26,12 @@ use std::ptr;
 
 // All Builders must have an llfn associated with them
 #[must_use]
-pub struct Builder<'a, 'll: 'a, 'tcx: 'll> {
+pub struct Builder<'a, 'll: 'a, 'tcx: 'll, V: 'll = &'ll Value> {
     pub llbuilder: &'ll mut llvm::Builder<'ll>,
-    pub cx: &'a CodegenCx<'ll, 'tcx>,
+    pub cx: &'a CodegenCx<'ll, 'tcx, V>,
 }
 
-impl Drop for Builder<'a, 'll, 'tcx> {
+impl<V> Drop for Builder<'_, '_, '_, V> {
     fn drop(&mut self) {
         unsafe {
             llvm::LLVMDisposeBuilder(&mut *(self.llbuilder as *mut _));
diff --git a/src/librustc_codegen_llvm/context.rs b/src/librustc_codegen_llvm/context.rs
index d6fd0690715..4c405150532 100644
--- a/src/librustc_codegen_llvm/context.rs
+++ b/src/librustc_codegen_llvm/context.rs
@@ -45,7 +45,7 @@ use abi::Abi;
 /// There is one `CodegenCx` per compilation unit. Each one has its own LLVM
 /// `llvm::Context` so that several compilation units may be optimized in parallel.
 /// All other LLVM data structures in the `CodegenCx` are tied to that `llvm::Context`.
-pub struct CodegenCx<'a, 'tcx: 'a> {
+pub struct CodegenCx<'a, 'tcx: 'a, V = &'a Value> {
     pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
     pub check_overflow: bool,
     pub use_dll_storage_attrs: bool,
@@ -57,12 +57,11 @@ pub struct CodegenCx<'a, 'tcx: 'a> {
     pub codegen_unit: Arc<CodegenUnit<'tcx>>,
 
     /// Cache instances of monomorphic and polymorphic items
-    pub instances: RefCell<FxHashMap<Instance<'tcx>, &'a Value>>,
+    pub instances: RefCell<FxHashMap<Instance<'tcx>, V>>,
     /// Cache generated vtables
-    pub vtables: RefCell<FxHashMap<(Ty<'tcx>, ty::PolyExistentialTraitRef<'tcx>),
-                                   &'a Value>>,
+    pub vtables: RefCell<FxHashMap<(Ty<'tcx>, ty::PolyExistentialTraitRef<'tcx>), V>>,
     /// Cache of constant strings,
-    pub const_cstr_cache: RefCell<FxHashMap<LocalInternedString, &'a Value>>,
+    pub const_cstr_cache: RefCell<FxHashMap<LocalInternedString, V>>,
 
     /// Reverse-direction for const ptrs cast from globals.
     /// Key is a Value holding a *T,
@@ -72,20 +71,20 @@ pub struct CodegenCx<'a, 'tcx: 'a> {
     /// when we ptrcast, and we have to ptrcast during codegen
     /// of a [T] const because we form a slice, a (*T,usize) pair, not
     /// a pointer to an LLVM array type. Similar for trait objects.
-    pub const_unsized: RefCell<FxHashMap<&'a Value, &'a Value>>,
+    pub const_unsized: RefCell<FxHashMap<V, V>>,
 
     /// Cache of emitted const globals (value -> global)
-    pub const_globals: RefCell<FxHashMap<&'a Value, &'a Value>>,
+    pub const_globals: RefCell<FxHashMap<V, V>>,
 
     /// List of globals for static variables which need to be passed to the
     /// LLVM function ReplaceAllUsesWith (RAUW) when codegen is complete.
     /// (We have to make sure we don't invalidate any Values referring
     /// to constants.)
-    pub statics_to_rauw: RefCell<Vec<(&'a Value, &'a Value)>>,
+    pub statics_to_rauw: RefCell<Vec<(V, V)>>,
 
     /// Statics that will be placed in the llvm.used variable
     /// See http://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details
-    pub used_statics: RefCell<Vec<&'a Value>>,
+    pub used_statics: RefCell<Vec<V>>,
 
     pub lltypes: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), &'a Type>>,
     pub scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'a Type>>,
@@ -94,11 +93,11 @@ pub struct CodegenCx<'a, 'tcx: 'a> {
 
     pub dbg_cx: Option<debuginfo::CrateDebugContext<'a, 'tcx>>,
 
-    eh_personality: Cell<Option<&'a Value>>,
-    eh_unwind_resume: Cell<Option<&'a Value>>,
-    pub rust_try_fn: Cell<Option<&'a Value>>,
+    eh_personality: Cell<Option<V>>,
+    eh_unwind_resume: Cell<Option<V>>,
+    pub rust_try_fn: Cell<Option<V>>,
 
-    intrinsics: RefCell<FxHashMap<&'static str, &'a Value>>,
+    intrinsics: RefCell<FxHashMap<&'static str, V>>,
 
     /// A counter that is used for generating local symbol names
     local_gen_sym_counter: Cell<usize>,
diff --git a/src/librustc_codegen_llvm/mir/analyze.rs b/src/librustc_codegen_llvm/mir/analyze.rs
index 2af772bd7ce..14f48a4ab63 100644
--- a/src/librustc_codegen_llvm/mir/analyze.rs
+++ b/src/librustc_codegen_llvm/mir/analyze.rs
@@ -21,8 +21,9 @@ use rustc::ty;
 use rustc::ty::layout::LayoutOf;
 use type_of::LayoutLlvmExt;
 use super::FunctionCx;
+use value::Value;
 
-pub fn non_ssa_locals(fx: &FunctionCx<'a, 'll, 'tcx>) -> BitSet<mir::Local> {
+pub fn non_ssa_locals(fx: &FunctionCx<'a, 'll, 'tcx, &'ll Value>) -> BitSet<mir::Local> {
     let mir = fx.mir;
     let mut analyzer = LocalAnalyzer::new(fx);
 
@@ -51,8 +52,8 @@ pub fn non_ssa_locals(fx: &FunctionCx<'a, 'll, 'tcx>) -> BitSet<mir::Local> {
     analyzer.non_ssa_locals
 }
 
-struct LocalAnalyzer<'mir, 'a: 'mir, 'll: 'a, 'tcx: 'll> {
-    fx: &'mir FunctionCx<'a, 'll, 'tcx>,
+struct LocalAnalyzer<'mir, 'a: 'mir, 'll: 'a, 'tcx: 'll, V: 'll> {
+    fx: &'mir FunctionCx<'a, 'll, 'tcx, V>,
     dominators: Dominators<mir::BasicBlock>,
     non_ssa_locals: BitSet<mir::Local>,
     // The location of the first visited direct assignment to each
@@ -60,8 +61,8 @@ struct LocalAnalyzer<'mir, 'a: 'mir, 'll: 'a, 'tcx: 'll> {
     first_assignment: IndexVec<mir::Local, Location>
 }
 
-impl LocalAnalyzer<'mir, 'a, 'll, 'tcx> {
-    fn new(fx: &'mir FunctionCx<'a, 'll, 'tcx>) -> Self {
+impl LocalAnalyzer<'mir, 'a, 'll, 'tcx, &'ll Value> {
+    fn new(fx: &'mir FunctionCx<'a, 'll, 'tcx, &'ll Value>) -> Self {
         let invalid_location =
             mir::BasicBlock::new(fx.mir.basic_blocks().len()).start_location();
         let mut analyzer = LocalAnalyzer {
@@ -102,7 +103,7 @@ impl LocalAnalyzer<'mir, 'a, 'll, 'tcx> {
     }
 }
 
-impl Visitor<'tcx> for LocalAnalyzer<'mir, 'a, 'll, 'tcx> {
+impl Visitor<'tcx> for LocalAnalyzer<'mir, 'a, 'll, 'tcx, &'ll Value> {
     fn visit_assign(&mut self,
                     block: mir::BasicBlock,
                     place: &mir::Place<'tcx>,
diff --git a/src/librustc_codegen_llvm/mir/block.rs b/src/librustc_codegen_llvm/mir/block.rs
index aeca4f1469f..aade8864864 100644
--- a/src/librustc_codegen_llvm/mir/block.rs
+++ b/src/librustc_codegen_llvm/mir/block.rs
@@ -34,7 +34,7 @@ use super::place::PlaceRef;
 use super::operand::OperandRef;
 use super::operand::OperandValue::{Pair, Ref, Immediate};
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     pub fn codegen_block(&mut self, bb: mir::BasicBlock) {
         let mut bx = self.build_block(bb);
         let data = &self.mir[bb];
diff --git a/src/librustc_codegen_llvm/mir/constant.rs b/src/librustc_codegen_llvm/mir/constant.rs
index 586a4907740..2c241d938e5 100644
--- a/src/librustc_codegen_llvm/mir/constant.rs
+++ b/src/librustc_codegen_llvm/mir/constant.rs
@@ -139,7 +139,7 @@ pub fn codegen_static_initializer(
     Ok((const_alloc_to_llvm(cx, alloc), alloc))
 }
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     fn fully_evaluate(
         &mut self,
         bx: &Builder<'a, 'll, 'tcx>,
diff --git a/src/librustc_codegen_llvm/mir/mod.rs b/src/librustc_codegen_llvm/mir/mod.rs
index b96305e08e0..7eda7ea0b7d 100644
--- a/src/librustc_codegen_llvm/mir/mod.rs
+++ b/src/librustc_codegen_llvm/mir/mod.rs
@@ -44,14 +44,14 @@ use rustc::mir::traversal;
 use self::operand::{OperandRef, OperandValue};
 
 /// Master context for codegenning from MIR.
-pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll> {
+pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll, V> {
     instance: Instance<'tcx>,
 
     mir: &'a mir::Mir<'tcx>,
 
     debug_context: FunctionDebugContext<'ll>,
 
-    llfn: &'ll Value,
+    llfn: V,
 
     cx: &'a CodegenCx<'ll, 'tcx>,
 
@@ -64,7 +64,7 @@ pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll> {
     /// don't really care about it very much. Anyway, this value
     /// contains an alloca into which the personality is stored and
     /// then later loaded when generating the DIVERGE_BLOCK.
-    personality_slot: Option<PlaceRef<'tcx, &'ll Value>>,
+    personality_slot: Option<PlaceRef<'tcx, V>>,
 
     /// A `Block` for each MIR `BasicBlock`
     blocks: IndexVec<mir::BasicBlock, &'ll BasicBlock>,
@@ -73,7 +73,8 @@ pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll> {
     cleanup_kinds: IndexVec<mir::BasicBlock, analyze::CleanupKind>,
 
     /// When targeting MSVC, this stores the cleanup info for each funclet
-    /// BB. This is initialized as we compute the funclets' head block in RPO.
+    /// BB. Thisrustup component add rustfmt-preview is initialized as we compute the funclets'
+    /// head block in RPO.
     funclets: &'a IndexVec<mir::BasicBlock, Option<Funclet<'ll>>>,
 
     /// This stores the landing-pad block for a given BB, computed lazily on GNU
@@ -98,7 +99,7 @@ pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll> {
     ///
     /// Avoiding allocs can also be important for certain intrinsics,
     /// notably `expect`.
-    locals: IndexVec<mir::Local, LocalRef<'tcx, &'ll Value>>,
+    locals: IndexVec<mir::Local, LocalRef<'tcx, V>>,
 
     /// Debug information for MIR scopes.
     scopes: IndexVec<mir::SourceScope, debuginfo::MirDebugScope<'ll>>,
@@ -107,7 +108,7 @@ pub struct FunctionCx<'a, 'll: 'a, 'tcx: 'll> {
     param_substs: &'tcx Substs<'tcx>,
 }
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     pub fn monomorphize<T>(&self, value: &T) -> T
         where T: TypeFoldable<'tcx>
     {
@@ -437,7 +438,7 @@ fn create_funclets(
 /// indirect.
 fn arg_local_refs(
     bx: &Builder<'a, 'll, 'tcx>,
-    fx: &FunctionCx<'a, 'll, 'tcx>,
+    fx: &FunctionCx<'a, 'll, 'tcx, &'ll Value>,
     scopes: &IndexVec<mir::SourceScope, debuginfo::MirDebugScope<'ll>>,
     memory_locals: &BitSet<mir::Local>,
 ) -> Vec<LocalRef<'tcx, &'ll Value>> {
diff --git a/src/librustc_codegen_llvm/mir/operand.rs b/src/librustc_codegen_llvm/mir/operand.rs
index c24f101177a..32609b06952 100644
--- a/src/librustc_codegen_llvm/mir/operand.rs
+++ b/src/librustc_codegen_llvm/mir/operand.rs
@@ -16,7 +16,7 @@ use rustc::ty::layout::{self, Align, LayoutOf, TyLayout};
 use base;
 use common::{CodegenCx, C_undef, C_usize};
 use builder::{Builder, MemFlags};
-use value::Value;
+use value::{Value, ValueTrait};
 use type_of::LayoutLlvmExt;
 use type_::Type;
 use glue;
@@ -60,7 +60,7 @@ pub struct OperandRef<'tcx, V> {
     pub layout: TyLayout<'tcx>,
 }
 
-impl fmt::Debug for OperandRef<'tcx, &'ll Value> {
+impl<Value: ?Sized> fmt::Debug for OperandRef<'tcx, &'ll Value> where Value: ValueTrait {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "OperandRef({:?} @ {:?})", self.val, self.layout)
     }
@@ -344,7 +344,7 @@ impl OperandValue<&'ll Value> {
     }
 }
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     fn maybe_codegen_consume_direct(&mut self,
                                   bx: &Builder<'a, 'll, 'tcx>,
                                   place: &mir::Place<'tcx>)
diff --git a/src/librustc_codegen_llvm/mir/place.rs b/src/librustc_codegen_llvm/mir/place.rs
index 46108615562..4dc9eeb5a9f 100644
--- a/src/librustc_codegen_llvm/mir/place.rs
+++ b/src/librustc_codegen_llvm/mir/place.rs
@@ -430,7 +430,7 @@ impl PlaceRef<'tcx, &'ll Value> {
     }
 }
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     pub fn codegen_place(&mut self,
                         bx: &Builder<'a, 'll, 'tcx>,
                         place: &mir::Place<'tcx>)
diff --git a/src/librustc_codegen_llvm/mir/rvalue.rs b/src/librustc_codegen_llvm/mir/rvalue.rs
index 580931fdbb3..af166fe501e 100644
--- a/src/librustc_codegen_llvm/mir/rvalue.rs
+++ b/src/librustc_codegen_llvm/mir/rvalue.rs
@@ -32,7 +32,7 @@ use super::{FunctionCx, LocalRef};
 use super::operand::{OperandRef, OperandValue};
 use super::place::PlaceRef;
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     pub fn codegen_rvalue(&mut self,
                         bx: Builder<'a, 'll, 'tcx>,
                         dest: PlaceRef<'tcx, &'ll Value>,
diff --git a/src/librustc_codegen_llvm/mir/statement.rs b/src/librustc_codegen_llvm/mir/statement.rs
index 8bda2c98594..8fa5a8cc551 100644
--- a/src/librustc_codegen_llvm/mir/statement.rs
+++ b/src/librustc_codegen_llvm/mir/statement.rs
@@ -16,8 +16,9 @@ use builder::Builder;
 use super::FunctionCx;
 use super::LocalRef;
 use super::OperandValue;
+use value::Value;
 
-impl FunctionCx<'a, 'll, 'tcx> {
+impl FunctionCx<'a, 'll, 'tcx, &'ll Value> {
     pub fn codegen_statement(&mut self,
                            bx: Builder<'a, 'll, 'tcx>,
                            statement: &mir::Statement<'tcx>)
diff --git a/src/librustc_codegen_llvm/value.rs b/src/librustc_codegen_llvm/value.rs
index 4bf5b09baa6..357cc8fbf80 100644
--- a/src/librustc_codegen_llvm/value.rs
+++ b/src/librustc_codegen_llvm/value.rs
@@ -15,12 +15,16 @@ use llvm;
 use std::fmt;
 use std::hash::{Hash, Hasher};
 
+pub trait ValueTrait: fmt::Debug {}
+
 impl PartialEq for Value {
     fn eq(&self, other: &Self) -> bool {
         self as *const _ == other as *const _
     }
 }
 
+impl ValueTrait for Value {}
+
 impl Eq for Value {}
 
 impl Hash for Value {