Remove unused imports

compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs

@@ -81,7 +81,6 @@ use rustc_span::Span;
 use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_trait_selection::traits::{self, translate_substs, wf, ObligationCtxt};
-use tracing::instrument;
 
 pub(super) fn check_min_specialization(tcx: TyCtxt<'_>, impl_def_id: LocalDefId) {
     if let Some(node) = parent_specialization_node(tcx, impl_def_id) {

compiler/rustc_middle/src/mir/terminator.rs

@@ -1,4 +1,4 @@
-use smallvec::{smallvec, SmallVec};
+use smallvec::SmallVec;
 
 use super::{BasicBlock, InlineAsmOperand, Operand, SourceInfo, TerminatorKind};
 use rustc_ast::InlineAsmTemplatePiece;

compiler/rustc_middle/src/ty/walk.rs

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

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -41,7 +41,6 @@ use rustc_span::{Span, SpanSnippetError, DUMMY_SP};
 use std::mem::take;
 use std::ops::{Deref, DerefMut};
 use thin_vec::{thin_vec, ThinVec};
-use tracing::{debug, trace};
 
 /// Creates a placeholder argument.
 pub(super) fn dummy_arg(ident: Ident) -> Param {

compiler/rustc_parse/src/parser/item.rs

@@ -24,7 +24,6 @@ use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::DUMMY_SP;
 use std::mem;
 use thin_vec::ThinVec;
-use tracing::debug;
 
 impl<'a> Parser<'a> {
     /// Parses a source module as a crate. This is the main entry point for the parser.

compiler/rustc_trait_selection/src/traits/util.rs

@@ -1,6 +1,5 @@
 use rustc_errors::Diagnostic;
 use rustc_span::Span;
-use smallvec::smallvec;
 use smallvec::SmallVec;
 
 use rustc_data_structures::fx::FxHashSet;