Remove some dead code (#17086)

* Remove some dead code

* Fix

* Remove unnecessary fn

* oops

Author: vzarytovskii

src/Compiler/Checking/CheckDeclarations.fs

@@ -920,11 +920,6 @@ module MutRecBindingChecking =
       /// A 'member' definition in a class
       | Phase2AMember of PreCheckingRecursiveBinding
 
-#if OPEN_IN_TYPE_DECLARATIONS
-      /// A dummy declaration, should we ever support 'open' in type definitions
-      | Phase2AOpen of SynOpenDeclTarget * range
-#endif
-
       /// Indicates the super init has just been called, 'this' may now be published
       | Phase2AIncrClassCtorJustAfterSuperInit 
 
@@ -1142,13 +1137,6 @@ module MutRecBindingChecking =
 
                             let innerState = (incrCtorInfoOpt, envForTycon, tpenv, recBindIdx, List.rev binds @ uncheckedBindsRev)
                             cbinds, innerState
-                        
-#if OPEN_IN_TYPE_DECLARATIONS
-                        | Some (SynMemberDefn.Open (target, m)), _ ->
-                            let innerState = (incrCtorInfoOpt, env, tpenv, recBindIdx, prelimRecValuesRev, uncheckedBindsRev)
-                            [ Phase2AOpen (target, m) ], innerState
-#endif
-                        
                         | definition -> 
                             error(InternalError(sprintf "Unexpected definition %A" definition, m)))
 
@@ -1196,9 +1184,6 @@ module MutRecBindingChecking =
                         let rest = 
                             let isAfter b = 
                                 match b with 
-#if OPEN_IN_TYPE_DECLARATIONS
-                                | Phase2AOpen _ 
-#endif
                                 | Phase2AIncrClassCtor _ | Phase2AInherit _ | Phase2AIncrClassCtorJustAfterSuperInit -> false
                                 | Phase2AIncrClassBindings (_, binds, _, _, _) -> binds |> List.exists (function SynBinding (kind=SynBindingKind.Do) -> true | _ -> false)
                                 | Phase2AIncrClassCtorJustAfterLastLet
@@ -1417,16 +1402,6 @@ module MutRecBindingChecking =
                         | Phase2AIncrClassCtorJustAfterLastLet -> 
                             let innerState = (tpenv, envInstance, envStatic, envNonRec, generalizedRecBinds, preGeneralizationRecBinds, uncheckedRecBindsTable)
                             Phase2BIncrClassCtorJustAfterLastLet, innerState
-                            
-                            
-#if OPEN_IN_TYPE_DECLARATIONS
-                        | Phase2AOpen(target, m) -> 
-                            let envInstance = TcOpenDecl cenv m scopem envInstance target
-                            let envStatic = TcOpenDecl cenv m scopem envStatic target
-                            let innerState = (tpenv, envInstance, envStatic, envNonRec, generalizedRecBinds, preGeneralizationRecBinds, uncheckedRecBindsTable)
-                            Phase2BOpen, innerState
-#endif
-
 
                         // Note: this path doesn't add anything the environment, because the member is already available off via its type 
 

src/Compiler/Checking/CheckExpressions.fs

@@ -2614,13 +2614,8 @@ module EventDeclarationNormalization =
 let FreshenObjectArgType (cenv: cenv) m rigid tcref isExtrinsic declaredTyconTypars =
     let g = cenv.g
 
-#if EXTENDED_EXTENSION_MEMBERS // indicates if extension members can add additional constraints to type parameters
-    let tcrefObjTy, enclosingDeclaredTypars, renaming, objTy =
-        FreshenTyconRef g m (if isExtrinsic then TyparRigidity.Flexible else rigid) tcref declaredTyconTypars
-#else
     let tcrefObjTy, enclosingDeclaredTypars, renaming, objTy =
         FreshenTyconRef g m rigid tcref declaredTyconTypars
-#endif
 
     // Struct members have a byref 'this' type (unless they are extrinsic extension members)
     let thisTy =
@@ -12386,11 +12381,7 @@ and FixupLetrecBind (cenv: cenv) denv generalizedTyparsForRecursiveBlock (bind:
 
     // Check coherence of generalization of variables for memberInfo members in generic classes
     match vspec.MemberInfo with
-#if EXTENDED_EXTENSION_MEMBERS // indicates if extension members can add additional constraints to type parameters
-    | Some _ when not vspec.IsExtensionMember ->
-#else
     | Some _ ->
-#endif
        match PartitionValTyparsForApparentEnclosingType g vspec with
        | Some(parentTypars, memberParentTypars, _, _, _) ->
           ignore(SignatureConformance.Checker(g, cenv.amap, denv, SignatureRepackageInfo.Empty, false).CheckTypars vspec.Range TypeEquivEnv.Empty memberParentTypars parentTypars)

src/Compiler/Checking/ConstraintSolver.fs

@@ -1058,10 +1058,6 @@ and SolveTypeEqualsType (csenv: ConstraintSolverEnv) ndeep m2 (trace: OptionalTr
     let aenv = csenv.EquivEnv
     let g = csenv.g
 
-    // Pre F# 6.0 we asssert the trait solution here
-#if TRAIT_CONSTRAINT_CORRECTIONS
-    if not (csenv.g.langVersion.SupportsFeature LanguageFeature.TraitConstraintCorrections) then
-#endif
     match cxsln with
     | Some (traitInfo, traitSln) when traitInfo.Solution.IsNone -> 
         // If this is an overload resolution at this point it's safe to assume the candidate member being evaluated solves this member constraint.
@@ -2895,22 +2891,11 @@ and ReportNoCandidatesErrorSynExpr csenv callerArgCounts methodName ad calledMet
 ///
 /// In F# 5.0 and 6.0 we assert this late by passing the cxsln parameter around. However this
 /// relies on not checking return types for SRTP constraints eagerly
-///
-/// Post F# 6.0 (TraitConstraintCorrections) we will assert this early and add a proper check that return types match for SRTP constraint solving
-/// (see alwaysCheckReturn)
-and AssumeMethodSolvesTrait (csenv: ConstraintSolverEnv) (cx: TraitConstraintInfo option) m trace (calledMeth: CalledMeth<_>) = 
+and AssumeMethodSolvesTrait (csenv: ConstraintSolverEnv) (cx: TraitConstraintInfo option) m _trace (calledMeth: CalledMeth<_>) = 
     match cx with
     | Some traitInfo when traitInfo.Solution.IsNone -> 
         let staticTyOpt = if calledMeth.Method.IsInstance then None else calledMeth.OptionalStaticType
         let traitSln = MemberConstraintSolutionOfMethInfo csenv.SolverState m calledMeth.Method calledMeth.CalledTyArgs staticTyOpt
-#if TRAIT_CONSTRAINT_CORRECTIONS
-        if csenv.g.langVersion.SupportsFeature LanguageFeature.TraitConstraintCorrections then
-            TransactMemberConstraintSolution traitInfo trace traitSln
-            None
-        else
-#else
-        ignore trace
-#endif
         Some (traitInfo, traitSln)
     | _ -> 
         None
@@ -2971,13 +2956,9 @@ and ResolveOverloading
           // Always take the return type into account for
           //    -- op_Explicit, op_Implicit
           //    -- candidate method sets that potentially use tupling of unfilled out args
-          ///   -- if TraitConstraintCorrections is enabled, also check return types for SRTP constraints
           let alwaysCheckReturn =
               isOpConversion ||
               candidates |> List.exists (fun cmeth -> cmeth.HasOutArgs) 
-#if TRAIT_CONSTRAINT_CORRECTIONS
-              || (csenv.g.langVersion.SupportsFeature LanguageFeature.TraitConstraintCorrections && cx.IsSome)
-#endif
 
           // Exact match rule.
           //

src/Compiler/Checking/MethodCalls.fs

@@ -430,14 +430,7 @@ let AdjustCalledArgType (infoReader: InfoReader) ad isConstraint enforceNullable
 
         // If the called method argument is an inref type, then the caller may provide a byref or value
         if isInByrefTy g calledArgTy then
-#if IMPLICIT_ADDRESS_OF
-            if isByrefTy g callerArgTy then 
-                calledArgTy
-            else 
-                destByrefTy g calledArgTy
-#else
             calledArgTy, TypeDirectedConversionUsed.No, None
-#endif
 
         // If the called method argument is a (non inref) byref type, then the caller may provide a byref or ref.
         elif isByrefTy g calledArgTy then
@@ -1371,12 +1364,6 @@ let AdjustCallerArgExpr tcVal (g: TcGlobals) amap infoReader ad isOutArg calledA
    if isByrefTy g calledArgTy && isRefCellTy g callerArgTy then 
        None, Expr.Op (TOp.RefAddrGet false, [destRefCellTy g callerArgTy], [callerArgExpr], m) 
 
-#if IMPLICIT_ADDRESS_OF
-   elif isInByrefTy g calledArgTy && not (isByrefTy g callerArgTy) then 
-       let wrap, callerArgExprAddress, _readonly, _writeonly = mkExprAddrOfExpr g true false NeverMutates callerArgExpr None m
-       Some wrap, callerArgExprAddress
-#endif
-
    // auto conversions to quotations (to match auto conversions to LINQ expressions)
    elif reflArgInfo.AutoQuote && isQuotedExprTy g calledArgTy && not (isQuotedExprTy g callerArgTy) then 
        match reflArgInfo with 
@@ -1943,13 +1930,6 @@ module ProvidedMethodCalls =
                 let infoReader = InfoReader(g, amap)
                 let exprR = CoerceFromFSharpFuncToDelegate g amap infoReader AccessorDomain.AccessibleFromSomewhere lambdaExprTy m lambdaExpr delegateTyR
                 None, (exprR, tyOfExpr g exprR)
-#if PROVIDED_ADDRESS_OF
-            | ProvidedAddressOfExpr e ->
-                let eR =  exprToExpr (exprType.PApply((fun _ -> e), m))
-                let wrap,exprR, _readonly, _writeonly = mkExprAddrOfExpr g true false DefinitelyMutates eR None m
-                let exprR = wrap exprR
-                None, (exprR, tyOfExpr g exprR)
-#endif
             | ProvidedDefaultExpr pty ->
                 let ty = Import.ImportProvidedType amap m (exprType.PApply((fun _ -> pty), m))
                 let exprR = mkDefault (m, ty)

src/Compiler/Checking/PatternMatchCompilation.fs

@@ -735,26 +735,6 @@ let ChooseInvestigationPointLeftToRight frontiers =
     | [] -> failwith "ChooseInvestigationPointLeftToRight: no frontiers!"
 
 
-
-#if OPTIMIZE_LIST_MATCHING
-// This is an initial attempt to remove extra typetests/castclass for simple list pattern matching "match x with h :: t -> ... | [] -> ..."
-// The problem with this technique is that it creates extra locals which inhibit the process of converting pattern matches into linear let bindings.
-
-[<return: Struct>]
-let (|ListConsDiscrim|_|) g = function
-     | (DecisionTreeTest.UnionCase (ucref, tinst))
-                (* check we can use a simple 'isinst' instruction *)
-                when tyconRefEq g ucref.TyconRef g.list_tcr_canon & ucref.CaseName = "op_ColonColon" -> ValueSome tinst
-     | _ -> ValueNone
-
-[<return: Struct>]
-let (|ListEmptyDiscrim|_|) g = function
-     | (DecisionTreeTest.UnionCase (ucref, tinst))
-                (* check we can use a simple 'isinst' instruction *)
-                when tyconRefEq g ucref.TyconRef g.list_tcr_canon & ucref.CaseName = "op_Nil" -> ValueSome tinst
-     | _ -> ValueNone
-#endif
-
 [<return: Struct>]
 let (|ConstNeedsDefaultCase|_|) c =
     match c with
@@ -806,17 +786,6 @@ let rec BuildSwitch inpExprOpt g expr edges dflt m =
     | TCase((DecisionTreeTest.IsNull | DecisionTreeTest.IsInst _), _) as edge :: edges, dflt  ->
         TDSwitch(expr, [edge], Some (BuildSwitch None g expr edges dflt m), m)
 
-#if OPTIMIZE_LIST_MATCHING
-    // 'cons/nil' tests where we have stored the result of the cons test in an 'isinst' in a variable
-    // In this case the 'expr' already holds the result of the 'isinst' test.
-    | [TCase(ListConsDiscrim g tinst, consCase)], Some emptyCase
-    | [TCase(ListEmptyDiscrim g tinst, emptyCase)], Some consCase
-    | [TCase(ListEmptyDiscrim g _, emptyCase); TCase(ListConsDiscrim g tinst, consCase)], None
-    | [TCase(ListConsDiscrim g tinst, consCase); TCase(ListEmptyDiscrim g _, emptyCase)], None
-                     when Option.isSome inpExprOpt ->
-        TDSwitch(expr, [TCase(DecisionTreeTest.IsNull, emptyCase)], Some consCase, m)
-#endif
-
     // All these should also always have default cases
     | TCase(DecisionTreeTest.Const ConstNeedsDefaultCase, _) :: _, None ->
         error(InternalError("inexhaustive match - need a default case!", m))
@@ -1272,25 +1241,6 @@ let CompilePatternBasic
                      AdjustValToHaveValReprInfo v origInputVal.TryDeclaringEntity ValReprInfo.emptyValData
                  Some addrExp, Some (mkInvisibleBind v e)
 
-
-
-#if OPTIMIZE_LIST_MATCHING
-         | [EdgeDiscrim(_, ListConsDiscrim g tinst, m); EdgeDiscrim(_, ListEmptyDiscrim g _, _)]
-         | [EdgeDiscrim(_, ListEmptyDiscrim g _, _); EdgeDiscrim(_, ListConsDiscrim g tinst, m)]
-         | [EdgeDiscrim(_, ListConsDiscrim g tinst, m)]
-         | [EdgeDiscrim(_, ListEmptyDiscrim g tinst, m)]
-                    (* check we can use a simple 'isinst' instruction *)
-                    when isNil origInputValTypars ->
-
-             let ucaseTy = (mkProvenUnionCaseTy g.cons_ucref tinst)
-             let v, vExpr = mkCompGenLocal m "unionTestResult" ucaseTy
-             if origInputVal.IsMemberOrModuleBinding then
-                 AdjustValToHaveValReprInfo v origInputVal.DeclaringEntity ValReprInfo.emptyValData
-             let argExpr = GetSubExprOfInput subexpr
-             let appExpr = mkIsInst ucaseTy argExpr mMatch
-             Some vExpr, Some (mkInvisibleBind v appExpr)
-#endif
-
          // Active pattern matches: create a variable to hold the results of executing the active pattern.
          // If a struct return we continue with an expression for taking the address of that location.
          | EdgeDiscrim(_, DecisionTreeTest.ActivePatternCase(activePatExpr, resTys, retKind, _apatVrefOpt, _, apinfo), m) :: _ ->
@@ -1343,9 +1293,6 @@ let CompilePatternBasic
                  let resPostBindOpt, ucaseBindOpt =
                      match discrim with
                      | DecisionTreeTest.UnionCase (ucref, tinst) when
-#if OPTIMIZE_LIST_MATCHING
-                                                           isNone inpExprOpt &&
-#endif
                                                           (isNil origInputValTypars &&
                                                            not origInputVal.IsMemberOrModuleBinding &&
                                                            not ucref.Tycon.IsStructRecordOrUnionTycon  &&

src/Compiler/Checking/PostInferenceChecks.fs

@@ -2144,10 +2144,6 @@ let CheckModuleBinding cenv env (TBind(v, e, _) as bind) =
 
                     error(Duplicate(kind, v.DisplayName, v.Range))
 
-#if CASES_IN_NESTED_CLASS
-                if tcref.IsUnionTycon && nm = "Cases" then
-                    errorR(NameClash(nm, kind, v.DisplayName, v.Range, "generated type", "Cases", tcref.Range))
-#endif
                 if tcref.IsUnionTycon then
                     match nm with
                     | "Tag" -> errorR(NameClash(nm, kind, v.DisplayName, v.Range, FSComp.SR.typeInfoGeneratedProperty(), "Tag", tcref.Range))

src/Compiler/Driver/CompilerImports.fs

@@ -2336,12 +2336,6 @@ and [<Sealed>] TcImports
             match resolutions.TryFindByOriginalReference assemblyReference with
             | Some assemblyResolution -> ResultD [ assemblyResolution ]
             | None ->
-#if NO_MSBUILD_REFERENCE_RESOLUTION
-                try
-                    ResultD [ tcConfig.ResolveLibWithDirectories assemblyReference ]
-                with e ->
-                    ErrorD e
-#else
                 // Next try to lookup up by the exact full resolved path.
                 match resolutions.TryFindByResolvedPath assemblyReference.Text with
                 | Some assemblyResolution -> ResultD [ assemblyResolution ]
@@ -2374,7 +2368,6 @@ and [<Sealed>] TcImports
                             // Note, if mode=ResolveAssemblyReferenceMode.Speculative and the resolution failed then TryResolveLibsUsingMSBuildRules returns
                             // the empty list and we convert the failure into an AssemblyNotResolved here.
                             ErrorD(AssemblyNotResolved(assemblyReference.Text, assemblyReference.Range))
-#endif
         )
 
     member tcImports.ResolveAssemblyReference(ctok, assemblyReference, mode) : AssemblyResolution list =

src/Compiler/Facilities/BuildGraph.fs

@@ -229,11 +229,7 @@ module GraphNode =
         match preferredUiLang with
         | Some s ->
             culture <- CultureInfo s
-#if FX_RESHAPED_GLOBALIZATION
-            CultureInfo.CurrentUICulture <- culture
-#else
             Thread.CurrentThread.CurrentUICulture <- culture
-#endif
         | None -> ()
 
 [<Sealed>]

src/Compiler/Optimize/Optimizer.fs

@@ -2521,13 +2521,6 @@ and MakeOptimizedSystemStringConcatCall cenv env m args =
           when IsILMethodRefSystemStringConcat ilMethRef ->
             optimizeArgs args accArgs
 
-// String constant folding requires a bit more work as we cannot quadratically concat strings at compile time.
-#if STRING_CONSTANT_FOLDING
-        // Optimize string constants, e.g. "1" + "2" will turn into "12"
-        | Expr.Const (Const.String str1, _, _), Expr.Const (Const.String str2, _, _) :: accArgs ->
-            mkString g m (str1 + str2) :: accArgs
-#endif
-
         | arg, _ -> arg :: accArgs
 
     and optimizeArgs args accArgs =

src/Compiler/SyntaxTree/XmlDoc.fs

@@ -118,46 +118,6 @@ type XmlDoc(unprocessedLines: string[], range: range) =
         with e ->
             warning (Error(FSComp.SR.xmlDocBadlyFormed (e.Message), doc.Range))
 
-#if CREF_ELABORATION
-    member doc.Elaborate(crefResolver) =
-        for see in
-            seq {
-                yield! xml.Descendants(XName.op_Implicit "see")
-                yield! xml.Descendants(XName.op_Implicit "seealso")
-                yield! xml.Descendants(XName.op_Implicit "exception")
-            } do
-            match see.Attribute(XName.op_Implicit "cref") with
-            | null -> warning (Error(FSComp.SR.xmlDocMissingCrossReference (), doc.Range))
-            | attr ->
-                let cref = attr.Value
-
-                if
-                    cref.StartsWith("T:")
-                    || cref.StartsWith("P:")
-                    || cref.StartsWith("M:")
-                    || cref.StartsWith("E:")
-                    || cref.StartsWith("F:")
-                then
-                    ()
-                else
-                    match crefResolver cref with
-                    | None -> warning (Error(FSComp.SR.xmlDocUnresolvedCrossReference (nm), doc.Range))
-                    | Some text ->
-                        attr.Value <- text
-                        modified <- true
-
-        if modified then
-            let m = doc.Range
-
-            let newLines =
-                [|
-                    for e in xml.Elements() do
-                        yield! e.ToString().Split([| '\r'; '\n' |], StringSplitOptions.RemoveEmptyEntries)
-                |]
-
-            lines <- newLines
-#endif
-
 // Discriminated unions can't contain statics, so we use a separate type
 and XmlDocStatics() =