1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index d9c3dbb630d..951163d35fa 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -433,6 +433,7 @@ impl<'a> StringReader<'a> {
                     self.filemap.record_multibyte_char(self.pos, new_ch_len);
                 }
             }
+            self.filemap.record_width(self.pos, new_ch);
         } else {
             self.ch = None;
             self.pos = new_pos;