From 37a16c4144ef072ca68deca7878bc1c6bbc27983 Mon Sep 17 00:00:00 2001
From: Petr <psfinaki@users.noreply.github.com>
Date: Wed, 13 Sep 2023 23:40:05 +0200
Subject: [PATCH] Fix a bug in a code fix

---
 .../CodeFixes/UseMutationWhenValueIsMutable.fs      |  6 +++++-
 .../CodeFixes/UseMutationWhenValueIsMutableTests.fs | 13 +++++++------
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/vsintegration/src/FSharp.Editor/CodeFixes/UseMutationWhenValueIsMutable.fs b/vsintegration/src/FSharp.Editor/CodeFixes/UseMutationWhenValueIsMutable.fs
index 27ad14755a2..e4f6e595252 100644
--- a/vsintegration/src/FSharp.Editor/CodeFixes/UseMutationWhenValueIsMutable.fs
+++ b/vsintegration/src/FSharp.Editor/CodeFixes/UseMutationWhenValueIsMutable.fs
@@ -35,7 +35,11 @@ type internal UseMutationWhenValueIsMutableCodeFixProvider [<ImportingConstructo
 
                     let adjustedPosition =
                         let rec loop ch pos =
-                            if Char.IsWhiteSpace(ch) then
+                            if
+                                Char.IsWhiteSpace(ch)
+                                // edge case - end of file
+                                || pos = sourceText.Length - 1
+                            then
                                 pos
                             else
                                 loop sourceText[pos + 1] (pos + 1)
diff --git a/vsintegration/tests/FSharp.Editor.Tests/CodeFixes/UseMutationWhenValueIsMutableTests.fs b/vsintegration/tests/FSharp.Editor.Tests/CodeFixes/UseMutationWhenValueIsMutableTests.fs
index 7323774a53d..b36d916bd48 100644
--- a/vsintegration/tests/FSharp.Editor.Tests/CodeFixes/UseMutationWhenValueIsMutableTests.fs
+++ b/vsintegration/tests/FSharp.Editor.Tests/CodeFixes/UseMutationWhenValueIsMutableTests.fs
@@ -47,14 +47,15 @@ let f x =
 
     Assert.Equal(expected, actual)
 
-[<Fact>]
-let ``Doesn't fix unrelated FS0020`` () =
-    let code =
-        """
+[<Theory>]
+[<InlineData """
 let square x = x * x
 square 32
-"""
-
+""">]
+[<InlineData """
+let band = {| Name = "R.E.M." |}
+band""">]
+let ``Doesn't fix unrelated FS0020`` code =
     let expected = None
 
     let actual = codeFix |> tryFix code Auto