diff --git a/library/init/data/string/basic.lean b/library/init/data/string/basic.lean
index 287bce06ef..358321006e 100644
--- a/library/init/data/string/basic.lean
+++ b/library/init/data/string/basic.lean
@@ -257,17 +257,6 @@ def prevn : Iterator → Nat → Iterator
 | it, i+1 => prevn it.prev i
 end Iterator
 
-private partial def lineColumnAux (s : String) : Pos → Nat × Nat → Nat × Nat
-| i, r@(line, col) =>
-  if atEnd s i then r
-  else
-    let c := s.get i;
-    if c = '\n' then lineColumnAux (s.next i) (line+1, 0)
-    else lineColumnAux (s.next i) (line, col+1)
-
-def lineColumn (s : String) (pos : Pos) : Nat × Nat :=
-lineColumnAux s 0 (1, 0)
-
 partial def offsetOfPosAux (s : String) (pos : Pos) : Pos → Nat → Nat
 | i, offset =>
   if i == pos || s.atEnd i then offset
diff --git a/tests/lean/string_imp.lean b/tests/lean/string_imp.lean
index 1b69c503d3..2d840ef558 100644
--- a/tests/lean/string_imp.lean
+++ b/tests/lean/string_imp.lean
@@ -7,9 +7,3 @@
 #eval "αβcc".mkIterator.next.next.pos
 #eval "αβcc".mkIterator.next.setCurr 'a'
 #eval "αβcd".mkIterator.toEnd.pos
-#eval "ab\n\nfoo bla".lineColumn 0
-#eval "ab\n\nfoo bla".lineColumn 1
-#eval "ab\n\nfoo bla".lineColumn 2
-#eval "ab\n\nfoo bla".lineColumn 3
-#eval "ab\n\nfoo bla".lineColumn 8
-#eval "ab\n\nfoo bla".lineColumn 100
diff --git a/tests/lean/string_imp.lean.expected.out b/tests/lean/string_imp.lean.expected.out
index bf4bf5bcf2..53ed150410 100644
--- a/tests/lean/string_imp.lean.expected.out
+++ b/tests/lean/string_imp.lean.expected.out
@@ -7,9 +7,3 @@
 4
 (String.Iterator.mk "αacc" 2)
 6
-(3, 7)
-(3, 7)
-(3, 7)
-(3, 7)
-(3, 7)
-(3, 7)