Remove ValueGenerics feature from swift-syntax

Author: Azoy

CodeGeneration/Sources/SyntaxSupport/ExperimentalFeatures.swift

@@ -19,7 +19,6 @@ public enum ExperimentalFeature: String, CaseIterable {
   case nonescapableTypes
   case trailingComma
   case coroutineAccessors
-  case valueGenerics
   case abiAttribute
   case keypathWithMethodMembers
   case oldOwnershipOperatorSpellings
@@ -39,8 +38,6 @@ public enum ExperimentalFeature: String, CaseIterable {
       return "TrailingComma"
     case .coroutineAccessors:
       return "CoroutineAccessors"
-    case .valueGenerics:
-      return "ValueGenerics"
     case .abiAttribute:
       return "ABIAttribute"
     case .keypathWithMethodMembers:
@@ -65,8 +62,6 @@ public enum ExperimentalFeature: String, CaseIterable {
       return "trailing commas"
     case .coroutineAccessors:
       return "coroutine accessors"
-    case .valueGenerics:
-      return "value generics"
     case .abiAttribute:
       return "@abi attribute"
     case .keypathWithMethodMembers:

CodeGeneration/Sources/SyntaxSupport/GenericNodes.swift

@@ -341,8 +341,7 @@ public let GENERIC_NODES: [Node] = [
           ),
           Child(
             name: "expr",
-            kind: .node(kind: .expr),
-            experimentalFeature: .valueGenerics
+            kind: .node(kind: .expr)
           ),
         ]),
         nameForDiagnostics: "left-hand type",
@@ -362,8 +361,7 @@ public let GENERIC_NODES: [Node] = [
           ),
           Child(
             name: "expr",
-            kind: .node(kind: .expr),
-            experimentalFeature: .valueGenerics
+            kind: .node(kind: .expr)
           ),
         ]),
         nameForDiagnostics: "right-hand type",

CodeGeneration/Sources/SyntaxSupport/TypeNodes.swift

@@ -264,8 +264,7 @@ public let TYPE_NODES: [Node] = [
           ),
           Child(
             name: "expr",
-            kind: .node(kind: .expr),
-            experimentalFeature: .valueGenerics
+            kind: .node(kind: .expr)
           ),
         ]),
         documentation:

Sources/SwiftParser/Types.swift

@@ -1135,12 +1135,6 @@ extension Parser {
 
 extension Parser {
   mutating func parseValueType() -> RawExprSyntax? {
-    // If the 'ValueGenerics' experimental feature hasn't been added, then don't
-    // attempt to parse values as types.
-    guard self.experimentalFeatures.contains(.valueGenerics) else {
-      return nil
-    }
-
     // Eat any '-' preceding integer literals.
     var minusSign: RawTokenSyntax? = nil
     if self.atContextualPunctuator("-"),