No completion on name of value and function declaration

src/fsharp/service/ServiceUntypedParse.fs

@@ -1248,6 +1248,9 @@ module UntypedParseImpl =
                             | _ -> defaultTraverse synBinding
 
                         match headPat with
+                        | SynPat.LongIdent(longDotId = lidwd) when rangeContainsPos lidwd.Range pos ->
+                            // let fo|o x = ()
+                            Some CompletionContext.Invalid
                         | SynPat.LongIdent(_,_,_,ctorArgs,_,_) ->
                             match ctorArgs with
                             | SynConstructorArgs.Pats(pats) ->
@@ -1264,6 +1267,9 @@ module UntypedParseImpl =
                                     | _ -> visitParam pat
                                 )
                             | _ -> defaultTraverse synBinding
+                        | SynPat.Named(range = range) when rangeContainsPos range pos ->
+                            // let fo|o = 1
+                            Some CompletionContext.Invalid
                         | _ -> defaultTraverse synBinding 
 
                     member __.VisitHashDirective(range) = 

vsintegration/tests/UnitTests/CompletionProviderTests.fs

@@ -457,13 +457,37 @@ type T
     VerifyNoCompletionList(fileContents, "type T")
 
 [<Test>]
-let ``No completion on function name at declaration site``() =
+let ``No completion on name of unfinished function declaration``() =
     let fileContents = """
 let f
 
 """
     VerifyNoCompletionList(fileContents, "let f")
 
+[<Test>]
+let ``No completion on name of value declaration``() =
+    let fileContents = """
+let xyz = 1
+
+"""
+    VerifyNoCompletionList(fileContents, "let xy")
+
+[<Test>]
+let ``No completion on name of function declaration``() =
+    let fileContents = """
+let foo x = 1
+
+"""
+    VerifyNoCompletionList(fileContents, "let fo")
+
+[<Test>]
+let ``No completion on name of tupled function declaration``() =
+    let fileContents = """
+let foo (x, y) = 1
+
+"""
+    VerifyNoCompletionList(fileContents, "let fo")
+
 [<Test>]
 let ``No completion on member name at declaration site``() =
     let fileContents = """