Re-export more rustc_span::symbol things from rustc_span.

`rustc_span::symbol` defines some things that are re-exported from
`rustc_span`, such as `Symbol` and `sym`. But it doesn't re-export some
closely related things such as `Ident` and `kw`. So you can do `use
rustc_span::{Symbol, sym}` but you have to do `use
rustc_span::symbol::{Ident, kw}`, which is inconsistent for no good
reason.

This commit re-exports `Ident`, `kw`, and `MacroRulesNormalizedIdent`,
and changes many `rustc_span::symbol::` qualifiers in `compiler/` to
`rustc_span::`. This is a 200+ net line of code reduction, mostly
because many files with two `use rustc_span` items can be reduced to
one.

compiler/rustc_lint/src/builtin.rs

@@ -39,8 +39,7 @@ pub use rustc_session::lint::builtin::*;
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
 use rustc_span::edition::Edition;
 use rustc_span::source_map::Spanned;
-use rustc_span::symbol::{Ident, Symbol, kw, sym};
-use rustc_span::{BytePos, InnerSpan, Span};
+use rustc_span::{BytePos, Ident, InnerSpan, Span, Symbol, kw, sym};
 use rustc_target::asm::InlineAsmArch;
 use rustc_trait_selection::infer::{InferCtxtExt, TyCtxtInferExt};
 use rustc_trait_selection::traits::misc::type_allowed_to_implement_copy;

compiler/rustc_lint/src/context.rs

@@ -23,9 +23,8 @@ use rustc_session::lint::{
     FutureIncompatibleInfo, Level, Lint, LintBuffer, LintExpectationId, LintId,
 };
 use rustc_session::{LintStoreMarker, Session};
-use rustc_span::Span;
 use rustc_span::edit_distance::find_best_match_for_names;
-use rustc_span::symbol::{Ident, Symbol, sym};
+use rustc_span::{Ident, Span, Symbol, sym};
 use tracing::debug;
 use {rustc_abi as abi, rustc_hir as hir};
 

compiler/rustc_lint/src/dangling.rs

@@ -4,8 +4,7 @@ use rustc_hir::intravisit::{FnKind, Visitor, walk_expr};
 use rustc_hir::{Block, Body, Expr, ExprKind, FnDecl, LangItem};
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_session::{declare_lint, impl_lint_pass};
-use rustc_span::Span;
-use rustc_span::symbol::sym;
+use rustc_span::{Span, sym};
 
 use crate::lints::DanglingPointersFromTemporaries;
 use crate::{LateContext, LateLintPass};

compiler/rustc_lint/src/early.rs

@@ -12,8 +12,7 @@ use rustc_feature::Features;
 use rustc_middle::ty::{RegisteredTools, TyCtxt};
 use rustc_session::Session;
 use rustc_session::lint::{BufferedEarlyLint, LintBuffer, LintPass};
-use rustc_span::Span;
-use rustc_span::symbol::Ident;
+use rustc_span::{Ident, Span};
 use tracing::debug;
 
 use crate::context::{EarlyContext, LintContext, LintStore};

compiler/rustc_lint/src/early/diagnostics.rs

@@ -11,8 +11,7 @@ use rustc_middle::middle::stability;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
 use rustc_session::lint::{BuiltinLintDiag, ElidedLifetimeResolution};
-use rustc_span::BytePos;
-use rustc_span::symbol::kw;
+use rustc_span::{BytePos, kw};
 use tracing::debug;
 
 use crate::lints::{self, ElidedNamedLifetime};

compiler/rustc_lint/src/early/diagnostics/check_cfg.rs

@@ -4,8 +4,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
 use rustc_session::config::ExpectedValues;
 use rustc_span::edit_distance::find_best_match_for_name;
-use rustc_span::symbol::Ident;
-use rustc_span::{ExpnKind, Span, Symbol, sym};
+use rustc_span::{ExpnKind, Ident, Span, Symbol, sym};
 
 use crate::lints;
 

compiler/rustc_lint/src/enum_intrinsics_non_enums.rs

@@ -2,8 +2,7 @@ use rustc_hir as hir;
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::visit::TypeVisitableExt;
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::Span;
-use rustc_span::symbol::sym;
+use rustc_span::{Span, sym};
 
 use crate::context::LintContext;
 use crate::lints::{EnumIntrinsicsMemDiscriminate, EnumIntrinsicsMemVariant};

compiler/rustc_lint/src/internal.rs

@@ -10,9 +10,8 @@ use rustc_hir::{
 };
 use rustc_middle::ty::{self, GenericArgsRef, Ty as MiddleTy};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::Span;
 use rustc_span::hygiene::{ExpnKind, MacroKind};
-use rustc_span::symbol::sym;
+use rustc_span::{Span, sym};
 use tracing::debug;
 
 use crate::lints::{

compiler/rustc_lint/src/levels.rs

@@ -20,8 +20,7 @@ use rustc_session::lint::builtin::{
     UNFULFILLED_LINT_EXPECTATIONS, UNKNOWN_LINTS, UNUSED_ATTRIBUTES,
 };
 use rustc_session::lint::{Level, Lint, LintExpectationId, LintId};
-use rustc_span::symbol::{Symbol, sym};
-use rustc_span::{DUMMY_SP, Span};
+use rustc_span::{DUMMY_SP, Span, Symbol, sym};
 use tracing::{debug, instrument};
 use {rustc_ast as ast, rustc_hir as hir};
 

compiler/rustc_lint/src/lints.rs

@@ -16,8 +16,7 @@ use rustc_middle::ty::{Clause, PolyExistentialTraitRef, Ty, TyCtxt};
 use rustc_session::Session;
 use rustc_session::lint::AmbiguityErrorDiag;
 use rustc_span::edition::Edition;
-use rustc_span::symbol::{Ident, MacroRulesNormalizedIdent};
-use rustc_span::{Span, Symbol, sym};
+use rustc_span::{Ident, MacroRulesNormalizedIdent, Span, Symbol, kw, sym};
 
 use crate::builtin::{InitError, ShorthandAssocTyCollector, TypeAliasBounds};
 use crate::errors::{OverruledAttributeSub, RequestedLevel};
@@ -2215,8 +2214,7 @@ pub(crate) struct UnexpectedCfgName {
 pub(crate) mod unexpected_cfg_name {
     use rustc_errors::DiagSymbolList;
     use rustc_macros::Subdiagnostic;
-    use rustc_span::symbol::Ident;
-    use rustc_span::{Span, Symbol};
+    use rustc_span::{Ident, Span, Symbol};
 
     #[derive(Subdiagnostic)]
     pub(crate) enum CodeSuggestion {
@@ -2689,7 +2687,7 @@ impl<G: EmissionGuarantee> LintDiagnostic<'_, G> for ElidedNamedLifetime {
         //  but currently this lint's suggestions can conflict with those of `clippy::needless_lifetimes`:
         //  https://github.com/rust-lang/rust/pull/129840#issuecomment-2323349119
         // HACK: `'static` suggestions will never sonflict, emit only those for now.
-        if name != rustc_span::symbol::kw::StaticLifetime {
+        if name != kw::StaticLifetime {
             return;
         }
         match kind {

compiler/rustc_lint/src/non_ascii_idents.rs

@@ -2,7 +2,7 @@ use rustc_ast as ast;
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::unord::UnordMap;
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::symbol::Symbol;
+use rustc_span::Symbol;
 use unicode_security::general_security_profile::IdentifierType;
 
 use crate::lints::{

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -8,8 +8,7 @@ use rustc_parse_format::{ParseMode, Parser, Piece};
 use rustc_session::lint::FutureIncompatibilityReason;
 use rustc_session::{declare_lint, declare_lint_pass};
 use rustc_span::edition::Edition;
-use rustc_span::symbol::kw;
-use rustc_span::{InnerSpan, Span, Symbol, hygiene, sym};
+use rustc_span::{InnerSpan, Span, Symbol, hygiene, kw, sym};
 use rustc_trait_selection::infer::InferCtxtExt;
 
 use crate::lints::{NonFmtPanicBraces, NonFmtPanicUnused};

compiler/rustc_lint/src/non_local_def.rs

@@ -5,8 +5,7 @@ use rustc_hir::{Body, HirId, Item, ItemKind, Node, Path, TyKind};
 use rustc_middle::ty::TyCtxt;
 use rustc_session::{declare_lint, impl_lint_pass};
 use rustc_span::def_id::{DefId, LOCAL_CRATE};
-use rustc_span::symbol::kw;
-use rustc_span::{ExpnKind, MacroKind, Span, sym};
+use rustc_span::{ExpnKind, MacroKind, Span, kw, sym};
 
 use crate::lints::{NonLocalDefinitionsCargoUpdateNote, NonLocalDefinitionsDiag};
 use crate::{LateContext, LateLintPass, LintContext, fluent_generated as fluent};

compiler/rustc_lint/src/nonstandard_style.rs

@@ -6,8 +6,7 @@ use rustc_middle::ty;
 use rustc_session::config::CrateType;
 use rustc_session::{declare_lint, declare_lint_pass};
 use rustc_span::def_id::LocalDefId;
-use rustc_span::symbol::{Ident, sym};
-use rustc_span::{BytePos, Span};
+use rustc_span::{BytePos, Ident, Span, sym};
 use {rustc_ast as ast, rustc_attr_parsing as attr, rustc_hir as hir};
 
 use crate::lints::{

compiler/rustc_lint/src/noop_method_call.rs

@@ -3,7 +3,7 @@ use rustc_hir::{Expr, ExprKind};
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::symbol::sym;
+use rustc_span::sym;
 
 use crate::context::LintContext;
 use crate::lints::{

compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs

@@ -5,8 +5,7 @@ use rustc_middle::ty::fold::BottomUpFolder;
 use rustc_middle::ty::print::{PrintTraitPredicateExt as _, TraitPredPrintModifiersAndPath};
 use rustc_middle::ty::{self, Ty, TypeFoldable};
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::Span;
-use rustc_span::symbol::kw;
+use rustc_span::{Span, kw};
 use rustc_trait_selection::traits::{self, ObligationCtxt};
 
 use crate::{LateContext, LateLintPass, LintContext};

compiler/rustc_lint/src/pass_by_value.rs

@@ -3,7 +3,7 @@ use rustc_hir::def::Res;
 use rustc_hir::{GenericArg, PathSegment, QPath, TyKind};
 use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::symbol::sym;
+use rustc_span::sym;
 
 use crate::lints::PassByValueDiag;
 use crate::{LateContext, LateLintPass, LintContext};

compiler/rustc_lint/src/passes.rs

@@ -136,7 +136,7 @@ macro_rules! early_lint_methods {
     ($macro:path, $args:tt) => (
         $macro!($args, [
             fn check_param(a: &rustc_ast::Param);
-            fn check_ident(a: &rustc_span::symbol::Ident);
+            fn check_ident(a: &rustc_span::Ident);
             fn check_crate(a: &rustc_ast::Crate);
             fn check_crate_post(a: &rustc_ast::Crate);
             fn check_item(a: &rustc_ast::Item);

compiler/rustc_lint/src/traits.rs

@@ -1,6 +1,6 @@
 use rustc_hir::{self as hir, LangItem};
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::symbol::sym;
+use rustc_span::sym;
 
 use crate::lints::{DropGlue, DropTraitConstraintsDiag};
 use crate::{LateContext, LateLintPass, LintContext};

compiler/rustc_lint/src/types.rs

@@ -12,8 +12,7 @@ use rustc_middle::ty::{
 };
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
 use rustc_span::def_id::LocalDefId;
-use rustc_span::symbol::sym;
-use rustc_span::{Span, Symbol, source_map};
+use rustc_span::{Span, Symbol, source_map, sym};
 use tracing::debug;
 use {rustc_ast as ast, rustc_hir as hir};
 

compiler/rustc_lint/src/unqualified_local_imports.rs

@@ -1,7 +1,7 @@
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{self as hir};
 use rustc_session::{declare_lint, declare_lint_pass};
-use rustc_span::symbol::kw;
+use rustc_span::kw;
 
 use crate::{LateContext, LateLintPass, LintContext, lints};
 

compiler/rustc_lint/src/unused.rs

@@ -11,8 +11,7 @@ use rustc_hir::{self as hir, LangItem};
 use rustc_infer::traits::util::elaborate;
 use rustc_middle::ty::{self, Ty, adjustment};
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
-use rustc_span::symbol::{Symbol, kw, sym};
-use rustc_span::{BytePos, Span};
+use rustc_span::{BytePos, Span, Symbol, kw, sym};
 use tracing::instrument;
 
 use crate::lints::{