add_elided_lifetime_in_path_suggestion -> rustc_session

src/librustc/lint.rs

@@ -3,7 +3,7 @@ use std::cmp;
 use crate::ich::StableHashingContext;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-use rustc_errors::{pluralize, Applicability, DiagnosticBuilder, DiagnosticId};
+use rustc_errors::{DiagnosticBuilder, DiagnosticId};
 use rustc_hir::HirId;
 use rustc_session::lint::{builtin, Level, Lint, LintId};
 use rustc_session::{DiagnosticMessageId, Session};
@@ -350,45 +350,3 @@ pub fn in_external_macro(sess: &Session, span: Span) -> bool {
         ExpnKind::Macro(..) => true, // definitely a plugin
     }
 }
-
-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,
-    );
-}

src/librustc_ast_lowering/path.rs

@@ -306,7 +306,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             E0726,
                             "implicit elided lifetime not allowed here"
                         );
-                        rustc::lint::add_elided_lifetime_in_path_suggestion(
+                        rustc_session::lint::add_elided_lifetime_in_path_suggestion(
                             &self.sess,
                             &mut err,
                             expected_lifetimes,

src/librustc_lint/context.rs

@@ -19,7 +19,6 @@ use self::TargetLint::*;
 use crate::levels::LintLevelsBuilder;
 use crate::passes::{EarlyLintPassObject, LateLintPassObject};
 use rustc::hir::map::definitions::{DefPathData, DisambiguatedDefPathData};
-use rustc::lint::add_elided_lifetime_in_path_suggestion;
 use rustc::lint::LintDiagnosticBuilder;
 use rustc::middle::privacy::AccessLevels;
 use rustc::middle::stability;
@@ -32,7 +31,7 @@ use rustc_data_structures::sync;
 use rustc_errors::{struct_span_err, Applicability};
 use rustc_hir as hir;
 use rustc_hir::def_id::{CrateNum, DefId};
-use rustc_session::lint::BuiltinLintDiagnostics;
+use rustc_session::lint::{add_elided_lifetime_in_path_suggestion, BuiltinLintDiagnostics};
 use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintId};
 use rustc_session::Session;
 use rustc_span::{symbol::Symbol, MultiSpan, Span, DUMMY_SP};

src/librustc_session/lint.rs

@@ -1,6 +1,7 @@
 pub use self::Level::*;
 use rustc_ast::node_id::{NodeId, NodeMap};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
+use rustc_errors::{pluralize, Applicability, DiagnosticBuilder};
 use rustc_span::edition::Edition;
 use rustc_span::{sym, symbol::Ident, MultiSpan, Span, Symbol};
 
@@ -367,3 +368,45 @@ macro_rules! declare_lint_pass {
         $crate::impl_lint_pass!($name => [$($lint),*]);
     };
 }
+
+pub fn add_elided_lifetime_in_path_suggestion(
+    sess: &crate::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,
+    );
+}