Remove extern crate smallvec from a couple of crates.

Author: nnethercote

compiler/rustc_middle/src/lib.rs

@@ -67,8 +67,6 @@
 
 #[macro_use]
 extern crate tracing;
-#[macro_use]
-extern crate smallvec;
 
 #[cfg(test)]
 mod tests;

compiler/rustc_middle/src/mir/terminator.rs

@@ -1,6 +1,6 @@
 /// Functionality for terminators and helper types that appear in terminators.
 use rustc_hir::LangItem;
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 
 use super::TerminatorKind;
 use rustc_data_structures::packed::Pu128;

compiler/rustc_middle/src/traits/mod.rs

@@ -26,7 +26,7 @@ use rustc_macros::{
 use rustc_span::def_id::{LocalDefId, CRATE_DEF_ID};
 use rustc_span::symbol::Symbol;
 use rustc_span::{Span, DUMMY_SP};
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 
 use std::borrow::Cow;
 use std::hash::{Hash, Hasher};

compiler/rustc_middle/src/ty/util.rs

@@ -22,7 +22,7 @@ use rustc_session::Limit;
 use rustc_span::sym;
 use rustc_target::abi::{Integer, IntegerType, Primitive, Size};
 use rustc_target::spec::abi::Abi;
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 use std::{fmt, iter};
 
 #[derive(Copy, Clone, Debug)]

compiler/rustc_middle/src/ty/walk.rs

@@ -4,7 +4,7 @@
 use crate::ty::{self, Ty};
 use crate::ty::{GenericArg, GenericArgKind};
 use rustc_data_structures::sso::SsoHashSet;
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 
 // The TypeWalker's stack is hot enough that it's worth going to some effort to
 // avoid heap allocations.

compiler/rustc_trait_selection/src/lib.rs

@@ -33,8 +33,6 @@
 extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
-#[macro_use]
-extern crate smallvec;
 
 pub mod errors;
 pub mod infer;

compiler/rustc_trait_selection/src/traits/util.rs

@@ -10,7 +10,7 @@ use rustc_middle::ty::GenericArgsRef;
 use rustc_middle::ty::{self, ImplSubject, ToPredicate, Ty, TyCtxt, TypeVisitableExt};
 use rustc_middle::ty::{TypeFoldable, TypeFolder, TypeSuperFoldable};
 use rustc_span::Span;
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 
 pub use rustc_infer::traits::util::*;
 

compiler/rustc_trait_selection/src/traits/vtable.rs

@@ -10,7 +10,7 @@ use rustc_middle::ty::visit::TypeVisitableExt;
 use rustc_middle::ty::GenericArgs;
 use rustc_middle::ty::{self, GenericParamDefKind, ToPredicate, Ty, TyCtxt, VtblEntry};
 use rustc_span::{sym, Span};
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 
 use std::fmt::Debug;
 use std::ops::ControlFlow;