Fixes

Author: kerams

src/FSharp.Core/prim-types.fs

@@ -4558,6 +4558,8 @@ namespace Microsoft.FSharp.Core
 
         let inline (<<) func2 func1 x = func2 (func1 x)
 
+        let (^) (s1: string) (s2: string) = String.Concat(s1, s2)
+
         [<CompiledName("DefaultArg")>]
         let defaultArg arg defaultValue = match arg with None -> defaultValue | Some v -> v
 

src/FSharp.Core/prim-types.fsi

@@ -3271,6 +3271,11 @@ namespace Microsoft.FSharp.Core
         [<CompiledName("DefaultValueArg")>]
         val defaultValueArg: arg: 'T voption -> defaultValue: 'T -> 'T 
 
+        /// <summary>Concatenate two strings. Use the '+' operator instead.</summary>
+        [<Obsolete("This construct is deprecated. Use the '+' operator instead.", true)>]
+        [<System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)>]
+        val (^): s1:string -> s2:string -> string
+
         /// <summary>Raises an exception</summary>
         ///
         /// <param name="exn">The exception to raise.</param>

tests/benchmarks/FCSBenchmarks/CompilerServiceBenchmarks/CompilerServiceBenchmarks.fs

@@ -84,7 +84,6 @@ type CompilerServiceBenchmarks() =
             LangVersionText = "default"
             IsInteractive = false
             ApplyLineDirectives = false
-            IndentationAwareSyntax = None
             StrictIndentation = None
             CompilingFSharpCore = false
             IsExe = false