rustc_middle: Remove trait DefIdTree
This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
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@@ -22,8 +22,7 @@ use rustc_middle::ty::layout::{LayoutError, MAX_SIMD_LANES};
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use rustc_middle::ty::subst::GenericArgKind;
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use rustc_middle::ty::util::{Discr, IntTypeExt};
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use rustc_middle::ty::{
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self, AdtDef, DefIdTree, ParamEnv, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable,
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TypeVisitableExt,
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self, AdtDef, ParamEnv, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitableExt,
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};
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use rustc_session::lint::builtin::{UNINHABITED_STATIC, UNSUPPORTED_CALLING_CONVENTIONS};
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use rustc_span::symbol::sym;
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@@ -16,8 +16,7 @@ use rustc_infer::traits::util;
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use rustc_middle::ty::error::{ExpectedFound, TypeError};
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use rustc_middle::ty::util::ExplicitSelf;
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use rustc_middle::ty::{
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self, DefIdTree, InternalSubsts, Ty, TypeFoldable, TypeFolder, TypeSuperFoldable,
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TypeVisitableExt,
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self, InternalSubsts, Ty, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt,
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};
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use rustc_middle::ty::{GenericParamDefKind, ToPredicate, TyCtxt};
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use rustc_span::Span;
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