diff --git a/src/librustc_codegen_llvm/abi.rs b/src/librustc_codegen_llvm/abi.rs
index 89e9e12a8a3..76fc5a6eeec 100644
--- a/src/librustc_codegen_llvm/abi.rs
+++ b/src/librustc_codegen_llvm/abi.rs
@@ -19,7 +19,7 @@ use type_of::{LayoutLlvmExt, PointerKind};
 use value::Value;
 use rustc_target::abi::call::ArgType;
 
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc_target::abi::{HasDataLayout, LayoutOf, Size, TyLayout, Abi as LayoutAbi};
 use rustc::ty::{self, Ty, Instance};
diff --git a/src/librustc_codegen_llvm/asm.rs b/src/librustc_codegen_llvm/asm.rs
index 7f0e18e1aeb..efbe7cad138 100644
--- a/src/librustc_codegen_llvm/asm.rs
+++ b/src/librustc_codegen_llvm/asm.rs
@@ -15,7 +15,7 @@ use builder::Builder;
 use value::Value;
 
 use rustc::hir;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::mir::operand::OperandValue;
diff --git a/src/librustc_codegen_llvm/attributes.rs b/src/librustc_codegen_llvm/attributes.rs
index a6ecd1ab55d..38ab1302cfa 100644
--- a/src/librustc_codegen_llvm/attributes.rs
+++ b/src/librustc_codegen_llvm/attributes.rs
@@ -21,7 +21,7 @@ use rustc::ty::query::Providers;
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_target::spec::PanicStrategy;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use attributes;
 use llvm::{self, Attribute};
diff --git a/src/librustc_codegen_llvm/back/lto.rs b/src/librustc_codegen_llvm/back/lto.rs
index 2fc8deeec8a..b5ebd0409da 100644
--- a/src/librustc_codegen_llvm/back/lto.rs
+++ b/src/librustc_codegen_llvm/back/lto.rs
@@ -12,7 +12,7 @@ use back::bytecode::{DecodedBytecode, RLIB_BYTECODE_EXTENSION};
 use rustc_codegen_ssa::back::symbol_export;
 use rustc_codegen_ssa::back::write::{ModuleConfig, CodegenContext, pre_lto_bitcode_filename};
 use rustc_codegen_ssa::back::lto::{SerializedModule, LtoModuleCodegen, ThinShared, ThinModule};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use back::write::{self, DiagnosticHandlers, with_llvm_pmb, save_temp_bitcode, get_llvm_opt_level};
 use errors::{FatalError, Handler};
 use llvm::archive_ro::ArchiveRO;
diff --git a/src/librustc_codegen_llvm/back/write.rs b/src/librustc_codegen_llvm/back/write.rs
index 97adfab516f..7945d381760 100644
--- a/src/librustc_codegen_llvm/back/write.rs
+++ b/src/librustc_codegen_llvm/back/write.rs
@@ -12,7 +12,7 @@ use attributes;
 use back::bytecode::{self, RLIB_BYTECODE_EXTENSION};
 use back::lto::ThinBuffer;
 use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig, run_assembler};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use base;
 use consts;
 use rustc::session::config::{self, OutputType, Passes, Lto};
diff --git a/src/librustc_codegen_llvm/base.rs b/src/librustc_codegen_llvm/base.rs
index 102fc95529d..a1ec133214a 100644
--- a/src/librustc_codegen_llvm/base.rs
+++ b/src/librustc_codegen_llvm/base.rs
@@ -42,7 +42,7 @@ use monomorphize::partitioning::CodegenUnitExt;
 use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_data_structures::small_c_str::SmallCStr;
 
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::back::write::submit_codegened_module_to_llvm;
 
 use std::ffi::CString;
diff --git a/src/librustc_codegen_llvm/builder.rs b/src/librustc_codegen_llvm/builder.rs
index b8df95e3183..a71fe781f6a 100644
--- a/src/librustc_codegen_llvm/builder.rs
+++ b/src/librustc_codegen_llvm/builder.rs
@@ -22,7 +22,7 @@ use rustc::ty::{self, Ty, TyCtxt};
 use rustc::ty::layout::{self, Align, Size, TyLayout};
 use rustc::session::config;
 use rustc_data_structures::small_c_str::SmallCStr;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use syntax;
 use rustc_codegen_ssa::base::to_immediate;
 use rustc_codegen_ssa::mir::operand::{OperandValue, OperandRef};
diff --git a/src/librustc_codegen_llvm/callee.rs b/src/librustc_codegen_llvm/callee.rs
index e7c6cc50eba..e79880e8de0 100644
--- a/src/librustc_codegen_llvm/callee.rs
+++ b/src/librustc_codegen_llvm/callee.rs
@@ -19,7 +19,7 @@ use llvm;
 use monomorphize::Instance;
 use context::CodegenCx;
 use value::Value;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc::ty::TypeFoldable;
 use rustc::ty::layout::{LayoutOf, HasTyCtxt};
diff --git a/src/librustc_codegen_llvm/common.rs b/src/librustc_codegen_llvm/common.rs
index 11fc67fb92b..2fc505d42db 100644
--- a/src/librustc_codegen_llvm/common.rs
+++ b/src/librustc_codegen_llvm/common.rs
@@ -18,7 +18,7 @@ use consts;
 use type_::Type;
 use type_of::LayoutLlvmExt;
 use value::Value;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc::ty::layout::{HasDataLayout, LayoutOf, self, TyLayout, Size};
 use rustc::mir::interpret::{Scalar, AllocType, Allocation};
diff --git a/src/librustc_codegen_llvm/consts.rs b/src/librustc_codegen_llvm/consts.rs
index 5e45a4f68ae..821ac931aac 100644
--- a/src/librustc_codegen_llvm/consts.rs
+++ b/src/librustc_codegen_llvm/consts.rs
@@ -26,7 +26,7 @@ use type_::Type;
 use type_of::LayoutLlvmExt;
 use value::Value;
 use rustc::ty::{self, Ty};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc::ty::layout::{self, Size, Align, LayoutOf};
 
diff --git a/src/librustc_codegen_llvm/context.rs b/src/librustc_codegen_llvm/context.rs
index 2e229c0f4d1..4a7ef9f8374 100644
--- a/src/librustc_codegen_llvm/context.rs
+++ b/src/librustc_codegen_llvm/context.rs
@@ -20,7 +20,7 @@ use value::Value;
 use monomorphize::partitioning::CodegenUnit;
 use type_::Type;
 use type_of::PointeeInfo;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use libc::c_uint;
 
 use rustc_data_structures::base_n;
diff --git a/src/librustc_codegen_llvm/debuginfo/gdb.rs b/src/librustc_codegen_llvm/debuginfo/gdb.rs
index d6a7f04e163..0046a072366 100644
--- a/src/librustc_codegen_llvm/debuginfo/gdb.rs
+++ b/src/librustc_codegen_llvm/debuginfo/gdb.rs
@@ -16,7 +16,7 @@ use common::CodegenCx;
 use builder::Builder;
 use rustc::session::config::DebugInfo;
 use value::Value;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use syntax::attr;
 
diff --git a/src/librustc_codegen_llvm/debuginfo/metadata.rs b/src/librustc_codegen_llvm/debuginfo/metadata.rs
index 8a72fef49d7..1c787a96932 100644
--- a/src/librustc_codegen_llvm/debuginfo/metadata.rs
+++ b/src/librustc_codegen_llvm/debuginfo/metadata.rs
@@ -17,7 +17,7 @@ use super::utils::{debug_context, DIB, span_start,
 use super::namespace::mangled_name_of_instance;
 use super::type_names::compute_debuginfo_type_name;
 use super::{CrateDebugContext};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use abi;
 use value::Value;
 
diff --git a/src/librustc_codegen_llvm/debuginfo/mod.rs b/src/librustc_codegen_llvm/debuginfo/mod.rs
index 3a7e393f1dc..9784cc6cf9c 100644
--- a/src/librustc_codegen_llvm/debuginfo/mod.rs
+++ b/src/librustc_codegen_llvm/debuginfo/mod.rs
@@ -49,7 +49,7 @@ use syntax_pos::{self, Span, Pos};
 use syntax::ast;
 use syntax::symbol::{Symbol, InternedString};
 use rustc::ty::layout::{self, LayoutOf, HasTyCtxt};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 pub mod gdb;
 mod utils;
diff --git a/src/librustc_codegen_llvm/debuginfo/source_loc.rs b/src/librustc_codegen_llvm/debuginfo/source_loc.rs
index e4065b6ef36..c6772e8c98e 100644
--- a/src/librustc_codegen_llvm/debuginfo/source_loc.rs
+++ b/src/librustc_codegen_llvm/debuginfo/source_loc.rs
@@ -17,7 +17,7 @@ use rustc_codegen_ssa::debuginfo::FunctionDebugContext;
 use llvm;
 use llvm::debuginfo::DIScope;
 use builder::Builder;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use libc::c_uint;
 use syntax_pos::{Span, Pos};
diff --git a/src/librustc_codegen_llvm/debuginfo/type_names.rs b/src/librustc_codegen_llvm/debuginfo/type_names.rs
index d8fd8b7f7f4..c3a15ccca0a 100644
--- a/src/librustc_codegen_llvm/debuginfo/type_names.rs
+++ b/src/librustc_codegen_llvm/debuginfo/type_names.rs
@@ -14,7 +14,7 @@ use common::CodegenCx;
 use rustc::hir::def_id::DefId;
 use rustc::ty::subst::Substs;
 use rustc::ty::{self, Ty};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc::hir;
 
diff --git a/src/librustc_codegen_llvm/debuginfo/utils.rs b/src/librustc_codegen_llvm/debuginfo/utils.rs
index ddd1a176957..89262beb356 100644
--- a/src/librustc_codegen_llvm/debuginfo/utils.rs
+++ b/src/librustc_codegen_llvm/debuginfo/utils.rs
@@ -19,7 +19,7 @@ use rustc::ty::DefIdTree;
 use llvm;
 use llvm::debuginfo::{DIScope, DIBuilder, DIDescriptor, DIArray};
 use common::{CodegenCx};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use syntax_pos::{self, Span};
 
diff --git a/src/librustc_codegen_llvm/declare.rs b/src/librustc_codegen_llvm/declare.rs
index 135780048ae..c23aab409a9 100644
--- a/src/librustc_codegen_llvm/declare.rs
+++ b/src/librustc_codegen_llvm/declare.rs
@@ -31,7 +31,7 @@ use abi::{Abi, FnType, FnTypeExt};
 use attributes;
 use context::CodegenCx;
 use type_::Type;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use value::Value;
 
 /// Declare a function.
diff --git a/src/librustc_codegen_llvm/intrinsic.rs b/src/librustc_codegen_llvm/intrinsic.rs
index c2f00d60af2..b2f1f933da4 100644
--- a/src/librustc_codegen_llvm/intrinsic.rs
+++ b/src/librustc_codegen_llvm/intrinsic.rs
@@ -32,7 +32,7 @@ use syntax::symbol::Symbol;
 use builder::Builder;
 use value::Value;
 
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use rustc::session::Session;
 use syntax_pos::Span;
diff --git a/src/librustc_codegen_llvm/lib.rs b/src/librustc_codegen_llvm/lib.rs
index 9d569a4e28c..f904a928d53 100644
--- a/src/librustc_codegen_llvm/lib.rs
+++ b/src/librustc_codegen_llvm/lib.rs
@@ -67,7 +67,7 @@ extern crate cc; // Used to locate MSVC
 extern crate tempfile;
 extern crate memmap;
 
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig};
 use rustc_codegen_ssa::back::lto::{SerializedModule, LtoModuleCodegen, ThinModule};
 use rustc_codegen_ssa::CompiledModule;
diff --git a/src/librustc_codegen_llvm/mono_item.rs b/src/librustc_codegen_llvm/mono_item.rs
index 7111644ebb8..9b2d17d65ca 100644
--- a/src/librustc_codegen_llvm/mono_item.rs
+++ b/src/librustc_codegen_llvm/mono_item.rs
@@ -18,7 +18,7 @@ use rustc::hir::def_id::{DefId, LOCAL_CRATE};
 use rustc::mir::mono::{Linkage, Visibility};
 use rustc::ty::TypeFoldable;
 use rustc::ty::layout::{LayoutOf, HasTyCtxt};
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 pub use rustc::mir::mono::MonoItem;
 
diff --git a/src/librustc_codegen_llvm/type_.rs b/src/librustc_codegen_llvm/type_.rs
index 53151fef509..5c4ebc35240 100644
--- a/src/librustc_codegen_llvm/type_.rs
+++ b/src/librustc_codegen_llvm/type_.rs
@@ -15,7 +15,7 @@ pub use llvm::Type;
 use llvm;
 use llvm::{Bool, False, True};
 use context::CodegenCx;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 use value::Value;
 
 use rustc::util::nodemap::FxHashMap;
diff --git a/src/librustc_codegen_llvm/type_of.rs b/src/librustc_codegen_llvm/type_of.rs
index 880da34137d..90c02cddb2b 100644
--- a/src/librustc_codegen_llvm/type_of.rs
+++ b/src/librustc_codegen_llvm/type_of.rs
@@ -16,7 +16,7 @@ use rustc::ty::layout::{self, Align, LayoutOf, Size, TyLayout};
 use rustc_target::abi::FloatTy;
 use rustc_mir::monomorphize::item::DefPathBasedNames;
 use type_::Type;
-use rustc_codegen_ssa::interfaces::*;
+use rustc_codegen_ssa::traits::*;
 
 use std::fmt::Write;
 
diff --git a/src/librustc_codegen_ssa/README.md b/src/librustc_codegen_ssa/README.md
index 2178c227956..b7bf0b099e9 100644
--- a/src/librustc_codegen_ssa/README.md
+++ b/src/librustc_codegen_ssa/README.md
@@ -20,7 +20,7 @@ For these reasons, the separation process involves two transformations that have
 1. replace all the LLVM-specific types by generics inside function signatures and structure definitions;
 2. encapsulate all functions calling the LLVM FFI inside a set of traits that will define the interface between backend-agnostic code and the backend.
 
-While the LLVM-specific code will be left in `rustc_codegen_llvm`, all the new interfaces and backend-agnostic code will be moved in `rustc_codegen_ssa` (name suggestion by @eddyb).
+While the LLVM-specific code will be left in `rustc_codegen_llvm`, all the new traits and backend-agnostic code will be moved in `rustc_codegen_ssa` (name suggestion by @eddyb).
 
 ## Generic types and structures
 
@@ -58,7 +58,7 @@ However, the two most important structures `CodegenCx` and `Builder` are not def
 
 ## Traits and interface
 
-Because they have to be defined by the backend, `CodegenCx` and `Builder` will be the structures implementing all the traits defining the backend's interface. These traits are defined in the folder `rustc_codegen_ssa/interfaces` and all the backend-agnostic code is parametrized by them. For instance, let us explain how a function in `base.rs` is parametrized:
+Because they have to be defined by the backend, `CodegenCx` and `Builder` will be the structures implementing all the traits defining the backend's interface. These traits are defined in the folder `rustc_codegen_ssa/traits` and all the backend-agnostic code is parametrized by them. For instance, let us explain how a function in `base.rs` is parametrized:
 
 ```rust
 pub fn codegen_instance<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
@@ -71,7 +71,7 @@ pub fn codegen_instance<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
 
 In this signature, we have the two lifetime parameters explained earlier and the master type `Bx` which satisfies the trait `BuilderMethods` corresponding to the interface satisfied by the `Builder` struct. The `BuilderMethods` defines an associated type `Bx::CodegenCx` that itself satisfies the `CodegenMethods` traits implemented by the struct `CodegenCx`.
 
-On the trait side, here is an example with part of the definition of `BuilderMethods` in `interfaces/builder.rs`:
+On the trait side, here is an example with part of the definition of `BuilderMethods` in `traits/builder.rs`:
 
 ```rust
 pub trait BuilderMethods<'a, 'tcx: 'a>:
@@ -116,6 +116,6 @@ However, the current separation between backend-agnostic and LLVM-specific code
 
 The `debuginfo` folder has been left almost untouched by the splitting and is specific to LLVM. Only its high-level features have been traitified.
 
-The new `interfaces` folder has 1500 LOC only for trait definitions. Overall, the 27,000 LOC-sized old `rustc_codegen_llvm` code has been split into the new 18,500 LOC-sized new `rustc_codegen_llvm` and the 12,000 LOC-sized `rustc_codegen_ssa`. We can say that this refactoring allowed the reuse of approximately 10,000 LOC that would otherwise have had to be duplicated between the multiple backends of `rustc`.
+The new `traits` folder has 1500 LOC only for trait definitions. Overall, the 27,000 LOC-sized old `rustc_codegen_llvm` code has been split into the new 18,500 LOC-sized new `rustc_codegen_llvm` and the 12,000 LOC-sized `rustc_codegen_ssa`. We can say that this refactoring allowed the reuse of approximately 10,000 LOC that would otherwise have had to be duplicated between the multiple backends of `rustc`.
 
 The refactored version of `rustc`'s backend introduced no regression over the test suite nor in performance benchmark, which is in coherence with the nature of the refactoring that used only compile-time parametricity (no trait objects).
diff --git a/src/librustc_codegen_ssa/back/lto.rs b/src/librustc_codegen_ssa/back/lto.rs
index f68a82d8780..8d03edca004 100644
--- a/src/librustc_codegen_ssa/back/lto.rs
+++ b/src/librustc_codegen_ssa/back/lto.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use super::write::CodegenContext;
-use interfaces::*;
+use traits::*;
 use ModuleCodegen;
 
 use rustc::util::time_graph::Timeline;
diff --git a/src/librustc_codegen_ssa/back/write.rs b/src/librustc_codegen_ssa/back/write.rs
index e8cf9e7f40a..46aee5339ba 100644
--- a/src/librustc_codegen_ssa/back/write.rs
+++ b/src/librustc_codegen_ssa/back/write.rs
@@ -26,7 +26,7 @@ use rustc::session::config::{self, OutputFilenames, OutputType, Passes, Sanitize
 use rustc::session::Session;
 use rustc::util::nodemap::FxHashMap;
 use rustc::util::time_graph::{self, TimeGraph, Timeline};
-use interfaces::*;
+use traits::*;
 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
 use rustc::ty::TyCtxt;
 use rustc::util::common::{time_depth, set_time_depth, print_time_passes_entry};
diff --git a/src/librustc_codegen_ssa/base.rs b/src/librustc_codegen_ssa/base.rs
index a590dcd3ea8..856bb9533c8 100644
--- a/src/librustc_codegen_ssa/base.rs
+++ b/src/librustc_codegen_ssa/base.rs
@@ -57,7 +57,7 @@ use rustc_data_structures::sync::Lrc;
 use rustc_codegen_utils::{symbol_names_test, check_for_rustc_errors_attr};
 use rustc::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};
 
-use interfaces::*;
+use traits::*;
 
 use std::any::Any;
 use std::cmp;
diff --git a/src/librustc_codegen_ssa/callee.rs b/src/librustc_codegen_ssa/callee.rs
index 3d8f96573db..5ff1d9b5992 100644
--- a/src/librustc_codegen_ssa/callee.rs
+++ b/src/librustc_codegen_ssa/callee.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use interfaces::*;
+use traits::*;
 use rustc::ty;
 use rustc::ty::subst::Substs;
 use rustc::hir::def_id::DefId;
diff --git a/src/librustc_codegen_ssa/common.rs b/src/librustc_codegen_ssa/common.rs
index 1115a74556c..6259318a3c9 100644
--- a/src/librustc_codegen_ssa/common.rs
+++ b/src/librustc_codegen_ssa/common.rs
@@ -15,10 +15,10 @@ use syntax_pos::{DUMMY_SP, Span};
 use rustc::hir::def_id::DefId;
 use rustc::middle::lang_items::LangItem;
 use base;
-use interfaces::*;
+use traits::*;
 
 use rustc::hir;
-use interfaces::BuilderMethods;
+use traits::BuilderMethods;
 
 pub fn type_needs_drop<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, ty: Ty<'tcx>) -> bool {
     ty.needs_drop(tcx, ty::ParamEnv::reveal_all())
diff --git a/src/librustc_codegen_ssa/glue.rs b/src/librustc_codegen_ssa/glue.rs
index 60485240bd6..515f36b5c65 100644
--- a/src/librustc_codegen_ssa/glue.rs
+++ b/src/librustc_codegen_ssa/glue.rs
@@ -18,7 +18,7 @@ use common::IntPredicate;
 use meth;
 use rustc::ty::layout::LayoutOf;
 use rustc::ty::{self, Ty};
-use interfaces::*;
+use traits::*;
 
 pub fn size_and_align_of_dst<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
     bx: &mut Bx,
diff --git a/src/librustc_codegen_ssa/lib.rs b/src/librustc_codegen_ssa/lib.rs
index e779d8f1469..24ede4db6e3 100644
--- a/src/librustc_codegen_ssa/lib.rs
+++ b/src/librustc_codegen_ssa/lib.rs
@@ -66,7 +66,7 @@ use syntax_pos::symbol::Symbol;
 mod diagnostics;
 
 pub mod common;
-pub mod interfaces;
+pub mod traits;
 pub mod mir;
 pub mod debuginfo;
 pub mod base;
diff --git a/src/librustc_codegen_ssa/meth.rs b/src/librustc_codegen_ssa/meth.rs
index ea573640da9..06c4f7a87d8 100644
--- a/src/librustc_codegen_ssa/meth.rs
+++ b/src/librustc_codegen_ssa/meth.rs
@@ -12,7 +12,7 @@ use rustc_target::abi::call::FnType;
 use callee;
 use rustc_mir::monomorphize;
 
-use interfaces::*;
+use traits::*;
 
 use rustc::ty::{self, Ty};
 
diff --git a/src/librustc_codegen_ssa/mir/analyze.rs b/src/librustc_codegen_ssa/mir/analyze.rs
index 2dc6ae3a049..c7e2c76c3e5 100644
--- a/src/librustc_codegen_ssa/mir/analyze.rs
+++ b/src/librustc_codegen_ssa/mir/analyze.rs
@@ -20,7 +20,7 @@ use rustc::mir::traversal;
 use rustc::ty;
 use rustc::ty::layout::{LayoutOf, HasTyCtxt};
 use super::FunctionCx;
-use interfaces::*;
+use traits::*;
 
 pub fn non_ssa_locals<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>>(
     fx: &FunctionCx<'a, 'tcx, Bx>
diff --git a/src/librustc_codegen_ssa/mir/block.rs b/src/librustc_codegen_ssa/mir/block.rs
index e358c057a43..1702ad19b76 100644
--- a/src/librustc_codegen_ssa/mir/block.rs
+++ b/src/librustc_codegen_ssa/mir/block.rs
@@ -21,7 +21,7 @@ use common::{self, IntPredicate};
 use meth;
 use rustc_mir::monomorphize;
 
-use interfaces::*;
+use traits::*;
 
 use syntax::symbol::Symbol;
 use syntax_pos::Pos;
diff --git a/src/librustc_codegen_ssa/mir/constant.rs b/src/librustc_codegen_ssa/mir/constant.rs
index b71a0bc54b1..568e1f0b38a 100644
--- a/src/librustc_codegen_ssa/mir/constant.rs
+++ b/src/librustc_codegen_ssa/mir/constant.rs
@@ -16,7 +16,7 @@ use rustc::mir::interpret::{GlobalId, ConstValue};
 use rustc::ty::{self, Ty};
 use rustc::ty::layout::{self, LayoutOf};
 use syntax::source_map::Span;
-use interfaces::*;
+use traits::*;
 
 use super::FunctionCx;
 
diff --git a/src/librustc_codegen_ssa/mir/mod.rs b/src/librustc_codegen_ssa/mir/mod.rs
index 873c3ee367c..0579afe1d49 100644
--- a/src/librustc_codegen_ssa/mir/mod.rs
+++ b/src/librustc_codegen_ssa/mir/mod.rs
@@ -18,7 +18,7 @@ use base;
 use debuginfo::{self, VariableAccess, VariableKind, FunctionDebugContext};
 use rustc_mir::monomorphize::Instance;
 use rustc_target::abi::call::{FnType, PassMode};
-use interfaces::*;
+use traits::*;
 
 use syntax_pos::{DUMMY_SP, NO_EXPANSION, BytePos, Span};
 use syntax::symbol::keywords;
diff --git a/src/librustc_codegen_ssa/mir/operand.rs b/src/librustc_codegen_ssa/mir/operand.rs
index 10b1dad5002..d574d89d67e 100644
--- a/src/librustc_codegen_ssa/mir/operand.rs
+++ b/src/librustc_codegen_ssa/mir/operand.rs
@@ -17,7 +17,7 @@ use base;
 use MemFlags;
 use glue;
 
-use interfaces::*;
+use traits::*;
 
 use std::fmt;
 
diff --git a/src/librustc_codegen_ssa/mir/place.rs b/src/librustc_codegen_ssa/mir/place.rs
index 39574f0c2a9..5b36ee8fd18 100644
--- a/src/librustc_codegen_ssa/mir/place.rs
+++ b/src/librustc_codegen_ssa/mir/place.rs
@@ -16,7 +16,7 @@ use MemFlags;
 use common::IntPredicate;
 use glue;
 
-use interfaces::*;
+use traits::*;
 
 use super::{FunctionCx, LocalRef};
 use super::operand::OperandValue;
diff --git a/src/librustc_codegen_ssa/mir/rvalue.rs b/src/librustc_codegen_ssa/mir/rvalue.rs
index 2cc7ed12550..6b1efa060fd 100644
--- a/src/librustc_codegen_ssa/mir/rvalue.rs
+++ b/src/librustc_codegen_ssa/mir/rvalue.rs
@@ -22,7 +22,7 @@ use callee;
 use common::{self, RealPredicate, IntPredicate};
 use rustc_mir::monomorphize;
 
-use interfaces::*;
+use traits::*;
 
 use super::{FunctionCx, LocalRef};
 use super::operand::{OperandRef, OperandValue};
diff --git a/src/librustc_codegen_ssa/mir/statement.rs b/src/librustc_codegen_ssa/mir/statement.rs
index 0303a221ac5..a69474142ab 100644
--- a/src/librustc_codegen_ssa/mir/statement.rs
+++ b/src/librustc_codegen_ssa/mir/statement.rs
@@ -10,11 +10,11 @@
 
 use rustc::mir;
 
-use interfaces::BuilderMethods;
+use traits::BuilderMethods;
 use super::FunctionCx;
 use super::LocalRef;
 use super::OperandValue;
-use interfaces::*;
+use traits::*;
 
 impl<'a, 'tcx: 'a, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     pub fn codegen_statement(
diff --git a/src/librustc_codegen_ssa/mono_item.rs b/src/librustc_codegen_ssa/mono_item.rs
index 508055ffc5a..53acb3e376c 100644
--- a/src/librustc_codegen_ssa/mono_item.rs
+++ b/src/librustc_codegen_ssa/mono_item.rs
@@ -20,7 +20,7 @@ use rustc::hir::def::Def;
 use rustc::mir::mono::{Linkage, Visibility};
 use rustc::ty::layout::HasTyCtxt;
 use std::fmt;
-use interfaces::*;
+use traits::*;
 
 pub use rustc::mir::mono::MonoItem;
 
diff --git a/src/librustc_codegen_ssa/interfaces/abi.rs b/src/librustc_codegen_ssa/traits/abi.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/abi.rs
rename to src/librustc_codegen_ssa/traits/abi.rs
diff --git a/src/librustc_codegen_ssa/interfaces/asm.rs b/src/librustc_codegen_ssa/traits/asm.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/asm.rs
rename to src/librustc_codegen_ssa/traits/asm.rs
diff --git a/src/librustc_codegen_ssa/interfaces/backend.rs b/src/librustc_codegen_ssa/traits/backend.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/backend.rs
rename to src/librustc_codegen_ssa/traits/backend.rs
diff --git a/src/librustc_codegen_ssa/interfaces/builder.rs b/src/librustc_codegen_ssa/traits/builder.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/builder.rs
rename to src/librustc_codegen_ssa/traits/builder.rs
diff --git a/src/librustc_codegen_ssa/interfaces/consts.rs b/src/librustc_codegen_ssa/traits/consts.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/consts.rs
rename to src/librustc_codegen_ssa/traits/consts.rs
diff --git a/src/librustc_codegen_ssa/interfaces/debuginfo.rs b/src/librustc_codegen_ssa/traits/debuginfo.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/debuginfo.rs
rename to src/librustc_codegen_ssa/traits/debuginfo.rs
diff --git a/src/librustc_codegen_ssa/interfaces/declare.rs b/src/librustc_codegen_ssa/traits/declare.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/declare.rs
rename to src/librustc_codegen_ssa/traits/declare.rs
diff --git a/src/librustc_codegen_ssa/interfaces/intrinsic.rs b/src/librustc_codegen_ssa/traits/intrinsic.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/intrinsic.rs
rename to src/librustc_codegen_ssa/traits/intrinsic.rs
diff --git a/src/librustc_codegen_ssa/interfaces/misc.rs b/src/librustc_codegen_ssa/traits/misc.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/misc.rs
rename to src/librustc_codegen_ssa/traits/misc.rs
diff --git a/src/librustc_codegen_ssa/interfaces/mod.rs b/src/librustc_codegen_ssa/traits/mod.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/mod.rs
rename to src/librustc_codegen_ssa/traits/mod.rs
diff --git a/src/librustc_codegen_ssa/interfaces/statics.rs b/src/librustc_codegen_ssa/traits/statics.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/statics.rs
rename to src/librustc_codegen_ssa/traits/statics.rs
diff --git a/src/librustc_codegen_ssa/interfaces/type_.rs b/src/librustc_codegen_ssa/traits/type_.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/type_.rs
rename to src/librustc_codegen_ssa/traits/type_.rs
diff --git a/src/librustc_codegen_ssa/interfaces/write.rs b/src/librustc_codegen_ssa/traits/write.rs
similarity index 100%
rename from src/librustc_codegen_ssa/interfaces/write.rs
rename to src/librustc_codegen_ssa/traits/write.rs