Avoid unnecessary `rustc_span::DUMMY_SP` usage.

In some cases `DUMMY_SP` is already imported. In other cases this commit
adds the necessary import, in files where `DUMMY_SP` is used more than
once.

3 files changed, 7 insertions, 9 deletions

diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index b592bd76e4c..aeb7137b722 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -408,7 +408,7 @@ impl Item {
 
     pub(crate) fn attr_span(&self, tcx: TyCtxt<'_>) -> rustc_span::Span {
         span_of_fragments(&self.attrs.doc_strings)
-            .unwrap_or_else(|| self.span(tcx).map_or(rustc_span::DUMMY_SP, |span| span.inner()))
+            .unwrap_or_else(|| self.span(tcx).map_or(DUMMY_SP, |span| span.inner()))
     }
 
     /// Combine all doc strings into a single value handling indentation and newlines as needed.
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 4e46f847fd7..a949f795753 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -56,7 +56,7 @@ use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::RustcVersion;
 use rustc_span::{
     symbol::{sym, Symbol},
-    BytePos, FileName, RealFileName,
+    BytePos, FileName, RealFileName, DUMMY_SP,
 };
 use serde::ser::SerializeMap;
 use serde::{Serialize, Serializer};
@@ -2414,7 +2414,7 @@ fn render_call_locations<W: fmt::Write>(mut w: W, cx: &mut Context<'_>, item: &c
         let contents = match fs::read_to_string(&path) {
             Ok(contents) => contents,
             Err(err) => {
-                let span = item.span(tcx).map_or(rustc_span::DUMMY_SP, |span| span.inner());
+                let span = item.span(tcx).map_or(DUMMY_SP, |span| span.inner());
                 tcx.dcx().span_err(span, format!("failed to read file {}: {err}", path.display()));
                 return false;
             }
@@ -2495,7 +2495,7 @@ fn render_call_locations<W: fmt::Write>(mut w: W, cx: &mut Context<'_>, item: &c
                 file.start_pos + BytePos(byte_max),
             ))
         })()
-        .unwrap_or(rustc_span::DUMMY_SP);
+        .unwrap_or(DUMMY_SP);
 
         let mut decoration_info = FxHashMap::default();
         decoration_info.insert("highlight focus", vec![byte_ranges.remove(0)]);
diff --git a/src/tools/clippy/clippy_lints/src/non_copy_const.rs b/src/tools/clippy/clippy_lints/src/non_copy_const.rs
index 73fc34c2450..5ca388d67a1 100644
--- a/src/tools/clippy/clippy_lints/src/non_copy_const.rs
+++ b/src/tools/clippy/clippy_lints/src/non_copy_const.rs
@@ -18,7 +18,7 @@ use rustc_middle::mir::interpret::{ErrorHandled, EvalToValTreeResult, GlobalId};
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_session::impl_lint_pass;
-use rustc_span::{sym, InnerSpan, Span};
+use rustc_span::{sym, DUMMY_SP, InnerSpan, Span};
 use rustc_target::abi::VariantIdx;
 
 // FIXME: this is a correctness problem but there's no suitable
@@ -290,9 +290,7 @@ impl NonCopyConst {
             promoted: None,
         };
         let param_env = cx.tcx.param_env(def_id).with_reveal_all_normalized(cx.tcx);
-        let result = cx
-            .tcx
-            .const_eval_global_id_for_typeck(param_env, cid, rustc_span::DUMMY_SP);
+        let result = cx.tcx.const_eval_global_id_for_typeck(param_env, cid, DUMMY_SP);
         self.is_value_unfrozen_raw(cx, result, ty)
     }
 
@@ -303,7 +301,7 @@ impl NonCopyConst {
             cx.tcx,
             cx.param_env,
             ty::UnevaluatedConst::new(def_id, args),
-            rustc_span::DUMMY_SP,
+            DUMMY_SP,
         );
         self.is_value_unfrozen_raw(cx, result, ty)
     }