prepare moving HardwiredLints to rustc_session

15 files changed, 187 insertions, 199 deletions

diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 548b3e27ac6..9783bc36ea5 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -4,14 +4,9 @@
 //! compiler code, rather than using their own custom pass. Those
 //! lints are all available in `rustc_lint::builtin`.
 
-use crate::lint::{FutureIncompatibleInfo, LateLintPass, LintArray, LintPass};
-use crate::middle::stability;
-use crate::session::Session;
-use rustc_errors::{pluralize, Applicability, DiagnosticBuilder};
-use rustc_session::declare_lint;
-use rustc_session::lint::BuiltinLintDiagnostics;
+use rustc_session::lint::FutureIncompatibleInfo;
+use rustc_session::{declare_lint, declare_lint_pass};
 use rustc_span::edition::Edition;
-use rustc_span::source_map::Span;
 use syntax::early_buffered_lints::{ILL_FORMED_ATTRIBUTE_INPUT, META_VARIABLE_MISUSE};
 
 declare_lint! {
@@ -512,125 +507,3 @@ declare_lint_pass! {
         SOFT_UNSTABLE,
     ]
 }
-
-impl LateLintPass<'_, '_> for HardwiredLints {}
-
-pub fn add_elided_lifetime_in_path_suggestion(
-    sess: &Session,
-    db: &mut DiagnosticBuilder<'_>,
-    n: usize,
-    path_span: Span,
-    incl_angl_brckt: bool,
-    insertion_span: Span,
-    anon_lts: String,
-) {
-    let (replace_span, suggestion) = if incl_angl_brckt {
-        (insertion_span, anon_lts)
-    } else {
-        // When possible, prefer a suggestion that replaces the whole
-        // `Path<T>` expression with `Path<'_, T>`, rather than inserting `'_, `
-        // at a point (which makes for an ugly/confusing label)
-        if let Ok(snippet) = sess.source_map().span_to_snippet(path_span) {
-            // But our spans can get out of whack due to macros; if the place we think
-            // we want to insert `'_` isn't even within the path expression's span, we
-            // should bail out of making any suggestion rather than panicking on a
-            // subtract-with-overflow or string-slice-out-out-bounds (!)
-            // FIXME: can we do better?
-            if insertion_span.lo().0 < path_span.lo().0 {
-                return;
-            }
-            let insertion_index = (insertion_span.lo().0 - path_span.lo().0) as usize;
-            if insertion_index > snippet.len() {
-                return;
-            }
-            let (before, after) = snippet.split_at(insertion_index);
-            (path_span, format!("{}{}{}", before, anon_lts, after))
-        } else {
-            (insertion_span, anon_lts)
-        }
-    };
-    db.span_suggestion(
-        replace_span,
-        &format!("indicate the anonymous lifetime{}", pluralize!(n)),
-        suggestion,
-        Applicability::MachineApplicable,
-    );
-}
-
-pub fn run_builtin_lint_diagnostics(
-    this: BuiltinLintDiagnostics,
-    sess: &Session,
-    db: &mut DiagnosticBuilder<'_>,
-) {
-    match this {
-        BuiltinLintDiagnostics::Normal => (),
-        BuiltinLintDiagnostics::BareTraitObject(span, is_global) => {
-            let (sugg, app) = match sess.source_map().span_to_snippet(span) {
-                Ok(s) if is_global => (format!("dyn ({})", s), Applicability::MachineApplicable),
-                Ok(s) => (format!("dyn {}", s), Applicability::MachineApplicable),
-                Err(_) => ("dyn <type>".to_string(), Applicability::HasPlaceholders),
-            };
-            db.span_suggestion(span, "use `dyn`", sugg, app);
-        }
-        BuiltinLintDiagnostics::AbsPathWithModule(span) => {
-            let (sugg, app) = match sess.source_map().span_to_snippet(span) {
-                Ok(ref s) => {
-                    // FIXME(Manishearth) ideally the emitting code
-                    // can tell us whether or not this is global
-                    let opt_colon = if s.trim_start().starts_with("::") { "" } else { "::" };
-
-                    (format!("crate{}{}", opt_colon, s), Applicability::MachineApplicable)
-                }
-                Err(_) => ("crate::<path>".to_string(), Applicability::HasPlaceholders),
-            };
-            db.span_suggestion(span, "use `crate`", sugg, app);
-        }
-        BuiltinLintDiagnostics::ProcMacroDeriveResolutionFallback(span) => {
-            db.span_label(
-                span,
-                "names from parent modules are not accessible without an explicit import",
-            );
-        }
-        BuiltinLintDiagnostics::MacroExpandedMacroExportsAccessedByAbsolutePaths(span_def) => {
-            db.span_note(span_def, "the macro is defined here");
-        }
-        BuiltinLintDiagnostics::ElidedLifetimesInPaths(
-            n,
-            path_span,
-            incl_angl_brckt,
-            insertion_span,
-            anon_lts,
-        ) => {
-            add_elided_lifetime_in_path_suggestion(
-                sess,
-                db,
-                n,
-                path_span,
-                incl_angl_brckt,
-                insertion_span,
-                anon_lts,
-            );
-        }
-        BuiltinLintDiagnostics::UnknownCrateTypes(span, note, sugg) => {
-            db.span_suggestion(span, &note, sugg, Applicability::MaybeIncorrect);
-        }
-        BuiltinLintDiagnostics::UnusedImports(message, replaces) => {
-            if !replaces.is_empty() {
-                db.tool_only_multipart_suggestion(
-                    &message,
-                    replaces,
-                    Applicability::MachineApplicable,
-                );
-            }
-        }
-        BuiltinLintDiagnostics::RedundantImport(spans, ident) => {
-            for (span, is_imported) in spans {
-                let introduced = if is_imported { "imported" } else { "defined" };
-                db.span_label(span, format!("the item `{}` is already {} here", ident, introduced));
-            }
-        }
-        BuiltinLintDiagnostics::DeprecatedMacro(suggestion, span) => {
-            stability::deprecation_suggestion(db, suggestion, span)
-        }
-    }
-}
diff --git a/src/librustc/lint/context.rs b/src/librustc/lint/context.rs
index 759ab3749d2..3f18f4dbd1f 100644
--- a/src/librustc/lint/context.rs
+++ b/src/librustc/lint/context.rs
@@ -20,13 +20,14 @@ use crate::hir::map::{definitions::DisambiguatedDefPathData, DefPathData};
 use crate::lint::levels::{LintLevelSets, LintLevelsBuilder};
 use crate::lint::{EarlyLintPassObject, LateLintPassObject};
 use crate::middle::privacy::AccessLevels;
+use crate::middle::stability;
 use crate::session::Session;
 use crate::ty::layout::{LayoutError, LayoutOf, TyLayout};
 use crate::ty::{self, print::Printer, subst::GenericArg, Ty, TyCtxt};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sync;
 use rustc_error_codes::*;
-use rustc_errors::{struct_span_err, DiagnosticBuilder};
+use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder};
 use rustc_hir as hir;
 use rustc_hir::def_id::{CrateNum, DefId};
 use rustc_session::lint::BuiltinLintDiagnostics;
@@ -466,6 +467,48 @@ impl LintPassObject for EarlyLintPassObject {}
 
 impl LintPassObject for LateLintPassObject {}
 
+pub fn add_elided_lifetime_in_path_suggestion(
+    sess: &Session,
+    db: &mut DiagnosticBuilder<'_>,
+    n: usize,
+    path_span: Span,
+    incl_angl_brckt: bool,
+    insertion_span: Span,
+    anon_lts: String,
+) {
+    let (replace_span, suggestion) = if incl_angl_brckt {
+        (insertion_span, anon_lts)
+    } else {
+        // When possible, prefer a suggestion that replaces the whole
+        // `Path<T>` expression with `Path<'_, T>`, rather than inserting `'_, `
+        // at a point (which makes for an ugly/confusing label)
+        if let Ok(snippet) = sess.source_map().span_to_snippet(path_span) {
+            // But our spans can get out of whack due to macros; if the place we think
+            // we want to insert `'_` isn't even within the path expression's span, we
+            // should bail out of making any suggestion rather than panicking on a
+            // subtract-with-overflow or string-slice-out-out-bounds (!)
+            // FIXME: can we do better?
+            if insertion_span.lo().0 < path_span.lo().0 {
+                return;
+            }
+            let insertion_index = (insertion_span.lo().0 - path_span.lo().0) as usize;
+            if insertion_index > snippet.len() {
+                return;
+            }
+            let (before, after) = snippet.split_at(insertion_index);
+            (path_span, format!("{}{}{}", before, anon_lts, after))
+        } else {
+            (insertion_span, anon_lts)
+        }
+    };
+    db.span_suggestion(
+        replace_span,
+        &format!("indicate the anonymous lifetime{}", pluralize!(n)),
+        suggestion,
+        Applicability::MachineApplicable,
+    );
+}
+
 pub trait LintContext: Sized {
     type PassObject: LintPassObject;
 
@@ -484,7 +527,85 @@ pub trait LintContext: Sized {
         diagnostic: BuiltinLintDiagnostics,
     ) {
         let mut db = self.lookup(lint, span, msg);
-        super::builtin::run_builtin_lint_diagnostics(diagnostic, self.sess(), &mut db);
+
+        let sess = self.sess();
+        match diagnostic {
+            BuiltinLintDiagnostics::Normal => (),
+            BuiltinLintDiagnostics::BareTraitObject(span, is_global) => {
+                let (sugg, app) = match sess.source_map().span_to_snippet(span) {
+                    Ok(s) if is_global => {
+                        (format!("dyn ({})", s), Applicability::MachineApplicable)
+                    }
+                    Ok(s) => (format!("dyn {}", s), Applicability::MachineApplicable),
+                    Err(_) => ("dyn <type>".to_string(), Applicability::HasPlaceholders),
+                };
+                db.span_suggestion(span, "use `dyn`", sugg, app);
+            }
+            BuiltinLintDiagnostics::AbsPathWithModule(span) => {
+                let (sugg, app) = match sess.source_map().span_to_snippet(span) {
+                    Ok(ref s) => {
+                        // FIXME(Manishearth) ideally the emitting code
+                        // can tell us whether or not this is global
+                        let opt_colon = if s.trim_start().starts_with("::") { "" } else { "::" };
+
+                        (format!("crate{}{}", opt_colon, s), Applicability::MachineApplicable)
+                    }
+                    Err(_) => ("crate::<path>".to_string(), Applicability::HasPlaceholders),
+                };
+                db.span_suggestion(span, "use `crate`", sugg, app);
+            }
+            BuiltinLintDiagnostics::ProcMacroDeriveResolutionFallback(span) => {
+                db.span_label(
+                    span,
+                    "names from parent modules are not accessible without an explicit import",
+                );
+            }
+            BuiltinLintDiagnostics::MacroExpandedMacroExportsAccessedByAbsolutePaths(span_def) => {
+                db.span_note(span_def, "the macro is defined here");
+            }
+            BuiltinLintDiagnostics::ElidedLifetimesInPaths(
+                n,
+                path_span,
+                incl_angl_brckt,
+                insertion_span,
+                anon_lts,
+            ) => {
+                add_elided_lifetime_in_path_suggestion(
+                    sess,
+                    &mut db,
+                    n,
+                    path_span,
+                    incl_angl_brckt,
+                    insertion_span,
+                    anon_lts,
+                );
+            }
+            BuiltinLintDiagnostics::UnknownCrateTypes(span, note, sugg) => {
+                db.span_suggestion(span, &note, sugg, Applicability::MaybeIncorrect);
+            }
+            BuiltinLintDiagnostics::UnusedImports(message, replaces) => {
+                if !replaces.is_empty() {
+                    db.tool_only_multipart_suggestion(
+                        &message,
+                        replaces,
+                        Applicability::MachineApplicable,
+                    );
+                }
+            }
+            BuiltinLintDiagnostics::RedundantImport(spans, ident) => {
+                for (span, is_imported) in spans {
+                    let introduced = if is_imported { "imported" } else { "defined" };
+                    db.span_label(
+                        span,
+                        format!("the item `{}` is already {} here", ident, introduced),
+                    );
+                }
+            }
+            BuiltinLintDiagnostics::DeprecatedMacro(suggestion, span) => {
+                stability::deprecation_suggestion(&mut db, suggestion, span)
+            }
+        }
+
         db.emit();
     }
 
diff --git a/src/librustc/lint/internal.rs b/src/librustc/lint/internal.rs
index 7b99b4af4f9..30679226b9b 100644
--- a/src/librustc/lint/internal.rs
+++ b/src/librustc/lint/internal.rs
@@ -1,13 +1,11 @@
 //! Some lints that are only useful in the compiler or crates that use compiler internals, such as
 //! Clippy.
 
-use crate::lint::{
-    EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintArray, LintContext, LintPass,
-};
+use crate::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::Applicability;
 use rustc_hir::{GenericArg, HirId, MutTy, Mutability, Path, PathSegment, QPath, Ty, TyKind};
-use rustc_session::declare_tool_lint;
+use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
 use rustc_span::symbol::{sym, Symbol};
 use syntax::ast::{Ident, Item, ItemKind};
 
diff --git a/src/librustc/lint/mod.rs b/src/librustc/lint/mod.rs
index e59e8ce1c0a..1aa4a43a2f2 100644
--- a/src/librustc/lint/mod.rs
+++ b/src/librustc/lint/mod.rs
@@ -21,6 +21,7 @@
 pub use self::Level::*;
 pub use self::LintSource::*;
 
+use crate::lint::builtin::HardwiredLints;
 use crate::ty::TyCtxt;
 use rustc_data_structures::sync;
 use rustc_errors::{DiagnosticBuilder, DiagnosticId};
@@ -33,48 +34,12 @@ use rustc_span::Span;
 use syntax::ast;
 
 pub use crate::lint::context::{
-    CheckLintNameResult, EarlyContext, LateContext, LintContext, LintStore,
+    add_elided_lifetime_in_path_suggestion, CheckLintNameResult, EarlyContext, LateContext,
+    LintContext, LintStore,
 };
 
 pub use rustc_session::lint::{BufferedEarlyLint, FutureIncompatibleInfo, Level, Lint, LintId};
-
-/// Declares a static `LintArray` and return it as an expression.
-#[macro_export]
-macro_rules! lint_array {
-    ($( $lint:expr ),* ,) => { lint_array!( $($lint),* ) };
-    ($( $lint:expr ),*) => {{
-        vec![$($lint),*]
-    }}
-}
-
-pub type LintArray = Vec<&'static Lint>;
-
-pub trait LintPass {
-    fn name(&self) -> &'static str;
-}
-
-/// Implements `LintPass for $name` with the given list of `Lint` statics.
-#[macro_export]
-macro_rules! impl_lint_pass {
-    ($name:ident => [$($lint:expr),* $(,)?]) => {
-        impl LintPass for $name {
-            fn name(&self) -> &'static str { stringify!($name) }
-        }
-        impl $name {
-            pub fn get_lints() -> LintArray { $crate::lint_array!($($lint),*) }
-        }
-    };
-}
-
-/// Declares a type named `$name` which implements `LintPass`.
-/// To the right of `=>` a comma separated list of `Lint` statics is given.
-#[macro_export]
-macro_rules! declare_lint_pass {
-    ($(#[$m:meta])* $name:ident => [$($lint:expr),* $(,)?]) => {
-        $(#[$m])* #[derive(Copy, Clone)] pub struct $name;
-        $crate::impl_lint_pass!($name => [$($lint),*]);
-    };
-}
+pub use rustc_session::lint::{LintArray, LintPass};
 
 #[macro_export]
 macro_rules! late_lint_methods {
@@ -166,6 +131,8 @@ macro_rules! declare_late_lint_pass {
 
 late_lint_methods!(declare_late_lint_pass, [], ['tcx]);
 
+impl LateLintPass<'_, '_> for HardwiredLints {}
+
 #[macro_export]
 macro_rules! expand_combined_late_lint_pass_method {
     ([$($passes:ident),*], $self: ident, $name: ident, $params:tt) => ({
diff --git a/src/librustc_ast_lowering/path.rs b/src/librustc_ast_lowering/path.rs
index b50295ebaae..65347d379bd 100644
--- a/src/librustc_ast_lowering/path.rs
+++ b/src/librustc_ast_lowering/path.rs
@@ -305,7 +305,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             E0726,
                             "implicit elided lifetime not allowed here"
                         );
-                        rustc::lint::builtin::add_elided_lifetime_in_path_suggestion(
+                        rustc::lint::add_elided_lifetime_in_path_suggestion(
                             &self.sess,
                             &mut err,
                             expected_lifetimes,
diff --git a/src/librustc_lint/array_into_iter.rs b/src/librustc_lint/array_into_iter.rs
index d8ddf7435b4..19d1052d1b2 100644
--- a/src/librustc_lint/array_into_iter.rs
+++ b/src/librustc_lint/array_into_iter.rs
@@ -1,5 +1,4 @@
-use crate::lint::{LateContext, LateLintPass, LintArray, LintContext, LintPass};
-use rustc::lint::FutureIncompatibleInfo;
+use rustc::lint::{FutureIncompatibleInfo, LateContext, LateLintPass, LintContext};
 use rustc::ty;
 use rustc::ty::adjustment::{Adjust, Adjustment};
 use rustc_errors::Applicability;
diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index 25f6361e050..befeb84e57c 100644
--- a/src/librustc_lint/builtin.rs
+++ b/src/librustc_lint/builtin.rs
@@ -21,13 +21,8 @@
 //! If you define a new `LateLintPass`, you will also need to add it to the
 //! `late_lint_methods!` invocation in `lib.rs`.
 
-use std::fmt::Write;
-
-use lint::{EarlyContext, EarlyLintPass, LateLintPass, LintPass};
-use lint::{LateContext, LintArray, LintContext};
 use rustc::hir::map::Map;
-use rustc::lint;
-use rustc::lint::FutureIncompatibleInfo;
+use rustc::lint::{self, EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
 use rustc::traits::misc::can_type_implement_copy;
 use rustc::ty::{self, layout::VariantIdx, Ty, TyCtxt};
 use rustc_data_structures::fx::FxHashSet;
@@ -39,6 +34,7 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::{GenericParamKind, PatKind};
 use rustc_hir::{HirIdSet, Node};
+use rustc_session::lint::FutureIncompatibleInfo;
 use rustc_span::edition::Edition;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Symbol};
@@ -52,6 +48,7 @@ use syntax::visit::FnKind;
 use crate::nonstandard_style::{method_context, MethodLateContext};
 
 use log::debug;
+use std::fmt::Write;
 
 // hardwired lints from librustc
 pub use lint::builtin::*;
diff --git a/src/librustc_lint/late.rs b/src/librustc_lint/late.rs
index 07c3b95d699..d8e0274cf43 100644
--- a/src/librustc_lint/late.rs
+++ b/src/librustc_lint/late.rs
@@ -16,7 +16,6 @@
 
 use rustc::hir::map::Map;
 use rustc::lint::LateContext;
-use rustc::lint::LintPass;
 use rustc::lint::{LateLintPass, LateLintPassObject};
 use rustc::ty::{self, TyCtxt};
 use rustc_data_structures::sync::{join, par_iter, ParallelIterator};
@@ -24,12 +23,13 @@ use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_hir::intravisit as hir_visit;
 use rustc_hir::intravisit::Visitor;
+use rustc_session::lint::LintPass;
 use rustc_span::Span;
-use std::slice;
 use syntax::ast;
+use syntax::walk_list;
 
 use log::debug;
-use syntax::walk_list;
+use std::slice;
 
 macro_rules! lint_callback { ($cx:expr, $f:ident, $($args:expr),*) => ({
     $cx.pass.$f(&$cx.context, $($args),*);
diff --git a/src/librustc_lint/lib.rs b/src/librustc_lint/lib.rs
index e272c3af468..e708ded603b 100644
--- a/src/librustc_lint/lib.rs
+++ b/src/librustc_lint/lib.rs
@@ -38,11 +38,12 @@ use rustc::lint::builtin::{
     BARE_TRAIT_OBJECTS, ELIDED_LIFETIMES_IN_PATHS, EXPLICIT_OUTLIVES_REQUIREMENTS,
     INTRA_DOC_LINK_RESOLUTION_FAILURE, MISSING_DOC_CODE_EXAMPLES, PRIVATE_DOC_TESTS,
 };
-use rustc::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintArray, LintPass};
+use rustc::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass};
 use rustc::ty::query::Providers;
 use rustc::ty::TyCtxt;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_session::lint::{LintArray, LintPass};
 
 use rustc_span::Span;
 use syntax::ast;
diff --git a/src/librustc_lint/non_ascii_idents.rs b/src/librustc_lint/non_ascii_idents.rs
index f30d0bcbdd5..522aeb6b144 100644
--- a/src/librustc_lint/non_ascii_idents.rs
+++ b/src/librustc_lint/non_ascii_idents.rs
@@ -1,4 +1,4 @@
-use crate::lint::{EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
+use rustc::lint::{EarlyContext, EarlyLintPass, LintContext};
 use syntax::ast;
 
 declare_lint! {
diff --git a/src/librustc_lint/nonstandard_style.rs b/src/librustc_lint/nonstandard_style.rs
index 7e5ad097698..f75bb9ba32c 100644
--- a/src/librustc_lint/nonstandard_style.rs
+++ b/src/librustc_lint/nonstandard_style.rs
@@ -1,6 +1,4 @@
-use lint::{EarlyContext, LateContext, LintArray, LintContext};
-use lint::{EarlyLintPass, LateLintPass, LintPass};
-use rustc::lint;
+use rustc::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
 use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
diff --git a/src/librustc_lint/redundant_semicolon.rs b/src/librustc_lint/redundant_semicolon.rs
index 9fc147f2a0c..dc18f15fe40 100644
--- a/src/librustc_lint/redundant_semicolon.rs
+++ b/src/librustc_lint/redundant_semicolon.rs
@@ -1,4 +1,4 @@
-use crate::lint::{EarlyContext, EarlyLintPass, LintArray, LintContext, LintPass};
+use rustc::lint::{EarlyContext, EarlyLintPass, LintContext};
 use rustc_errors::Applicability;
 use syntax::ast::{ExprKind, Stmt, StmtKind};
 
diff --git a/src/librustc_lint/types.rs b/src/librustc_lint/types.rs
index f128e25f35b..ab6841c0c09 100644
--- a/src/librustc_lint/types.rs
+++ b/src/librustc_lint/types.rs
@@ -1,9 +1,6 @@
 #![allow(non_snake_case)]
 
-use crate::hir::def_id::DefId;
-use lint::{LateContext, LintArray, LintContext};
-use lint::{LateLintPass, LintPass};
-use rustc::lint;
+use rustc::lint::{LateContext, LateLintPass, LintContext};
 use rustc::mir::interpret::{sign_extend, truncate};
 use rustc::ty::layout::{self, IntegerExt, LayoutOf, SizeSkeleton, VariantIdx};
 use rustc::ty::subst::SubstsRef;
@@ -11,6 +8,7 @@ use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
 use rustc_hir::{is_range_literal, ExprKind, Node};
 use rustc_index::vec::Idx;
 use rustc_span::source_map;
diff --git a/src/librustc_lint/unused.rs b/src/librustc_lint/unused.rs
index d57f565d919..da8a23f041e 100644
--- a/src/librustc_lint/unused.rs
+++ b/src/librustc_lint/unused.rs
@@ -1,7 +1,5 @@
-use lint::{EarlyContext, LateContext, LintArray, LintContext};
-use lint::{EarlyLintPass, LateLintPass, LintPass};
-use rustc::lint;
 use rustc::lint::builtin::UNUSED_ATTRIBUTES;
+use rustc::lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
 use rustc::ty::adjustment;
 use rustc::ty::{self, Ty};
 use rustc_data_structures::fx::FxHashMap;
diff --git a/src/librustc_session/lint.rs b/src/librustc_session/lint.rs
index 24e42928f63..40d40ce7211 100644
--- a/src/librustc_session/lint.rs
+++ b/src/librustc_session/lint.rs
@@ -326,3 +326,41 @@ macro_rules! declare_tool_lint {
         };
     );
 }
+
+/// Declares a static `LintArray` and return it as an expression.
+#[macro_export]
+macro_rules! lint_array {
+    ($( $lint:expr ),* ,) => { lint_array!( $($lint),* ) };
+    ($( $lint:expr ),*) => {{
+        vec![$($lint),*]
+    }}
+}
+
+pub type LintArray = Vec<&'static Lint>;
+
+pub trait LintPass {
+    fn name(&self) -> &'static str;
+}
+
+/// Implements `LintPass for $name` with the given list of `Lint` statics.
+#[macro_export]
+macro_rules! impl_lint_pass {
+    ($name:ident => [$($lint:expr),* $(,)?]) => {
+        impl $crate::lint::LintPass for $name {
+            fn name(&self) -> &'static str { stringify!($name) }
+        }
+        impl $name {
+            pub fn get_lints() -> $crate::lint::LintArray { $crate::lint_array!($($lint),*) }
+        }
+    };
+}
+
+/// Declares a type named `$name` which implements `LintPass`.
+/// To the right of `=>` a comma separated list of `Lint` statics is given.
+#[macro_export]
+macro_rules! declare_lint_pass {
+    ($(#[$m:meta])* $name:ident => [$($lint:expr),* $(,)?]) => {
+        $(#[$m])* #[derive(Copy, Clone)] pub struct $name;
+        $crate::impl_lint_pass!($name => [$($lint),*]);
+    };
+}