1 files changed, 7 insertions, 0 deletions
diff --git a/src/librustc_span/source_map.rs b/src/librustc_span/source_map.rs
index 65095c6f131..353f7b3f52b 100644
--- a/src/librustc_span/source_map.rs
+++ b/src/librustc_span/source_map.rs
@@ -517,6 +517,13 @@ impl SourceMap {
         Ok((lo, hi))
     }
 
+    pub fn is_line_before_span_empty(&self, sp: Span) -> bool {
+        match self.span_to_prev_source(sp) {
+            Ok(s) => s.split('\n').last().map(|l| l.trim_start().is_empty()).unwrap_or(false),
+            Err(_) => false,
+        }
+    }
+
     pub fn span_to_lines(&self, sp: Span) -> FileLinesResult {
         debug!("span_to_lines(sp={:?})", sp);
         let (lo, hi) = self.is_valid_span(sp)?;