Property wrapper backing initializers are not dynamically replaceable

Author: aschwaighofer

lib/SIL/SILDeclRef.cpp

@@ -1065,7 +1065,8 @@ bool SILDeclRef::canBeDynamicReplacement() const {
 bool SILDeclRef::isDynamicallyReplaceable() const {
   if (kind == SILDeclRef::Kind::DefaultArgGenerator)
     return false;
-  if (isStoredPropertyInitializer())
+  if (isStoredPropertyInitializer() ||
+      kind == SILDeclRef::Kind::PropertyWrapperBackingInitializer)
     return false;
 
   // Class allocators are not dynamic replaceable.

test/SILGen/dynamically_replaceable.swift

@@ -404,3 +404,17 @@ public func testWithLocalFun() {
   let unamedClosure = { print("foo") }
   unamedClosure()
 }
+
+@propertyWrapper
+struct WrapperWithInitialValue<T> {
+  var wrappedValue: T
+
+  init(wrappedValue initialValue: T) {
+    self.wrappedValue = initialValue
+  }
+}
+
+// CHECK-LABEL: sil hidden [ossa] @$s23dynamically_replaceable10SomeStructV1tSbvpfP
+public struct SomeStruct {
+  @WrapperWithInitialValue var t = false
+}