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.
uninlined_format_args
rustc_ast_lowering
ref
#[rustc_box]
Box::new
DefIdTree
Rptr
Ref
#![feature(impl_trait_in_fn_trait_return)]