Fix 291

src/Fantomas.Tests/OperatorTests.fs

@@ -177,9 +177,18 @@ let ``should pipeline monadic bind``() =
 >>= strAddLong "A long argument that is ignored" "2"
 """
 
+[<Test>]
+let ``should keep >>.~ operator``() =
+    formatSourceString false """let (>>.~) (g : int) (h : int) : int = g + h
+let output = 2 >>.~ 3
+    """ config
+    |> should equal """let (>>.~) (g : int) (h : int) : int = g + h
+let output = 2 >>.~ 3
+"""
+
 [<Test>]
 let ``should not add newline before = operator after |>``() =
     formatSourceString false """1 |> max 0 = 1""" config
     |> should equal """1
 |> max 0 = 1
-"""
+"""

src/Fantomas/TokenMatcher.fs

@@ -30,6 +30,7 @@ let tokenize defines (content : string) =
         for (i, line) in lines |> Seq.zip [1..lines.Length] do 
             let lineTokenizer = sourceTokenizer.CreateLineTokenizer line
             let finLine = ref false
+            let mutable lastColumn = 0
             while not !finLine do
                 let tok, newLexState = lineTokenizer.ScanToken(!lexState)
                 lexState := newLexState
@@ -40,6 +41,11 @@ let tokenize defines (content : string) =
                         yield (EOL, Environment.NewLine) 
                     finLine := true
                 | Some t -> 
+                    if lastColumn + 1 < t.LeftColumn then
+                        // workaround for cases where tokenizer dont output "delayed" part of operator after ">."
+                        // See https://github.com/fsharp/FSharp.Compiler.Service/issues/874
+                        yield (Tok({ t with TokenName="DELAYED" }, i), line.[lastColumn+1..t.LeftColumn-1]) 
+                    lastColumn <- t.RightColumn
                     yield (Tok(t, i), line.[t.LeftColumn..t.RightColumn]) 
     }