[region-isolation] Tweak the main transferring diagnostic.

Specifically, I am transforming it from "may cause a race" -> "may cause a data
race". Adding data is a small thing, but it adds a bunch of nice clarity.

Author: gottesmm

include/swift/AST/DiagnosticsSIL.def

@@ -973,7 +973,7 @@ NOTE(regionbasedisolation_isolated_since_in_same_region_basename, none,
 //
 
 ERROR(regionbasedisolation_named_transfer_yields_race, none,
-      "transferring %0 may cause a race",
+      "transferring %0 may cause a data race",
       (Identifier))
 
 NOTE(regionbasedisolation_named_info_transfer_yields_race, none,

test/ClangImporter/transferring_objc.swift

@@ -25,7 +25,7 @@ func methodTestTransferringResult() async {
 func methodTestTransferringArg() async {
   let x = MyType()
   let s = NSObject()
-  let _ = x.getResultWithTransferringArgument(s)  // expected-error {{transferring 's' may cause a race}}
+  let _ = x.getResultWithTransferringArgument(s)  // expected-error {{transferring 's' may cause a data race}}
   // expected-note @-1 {{'s' used after being passed as a transferring parameter; Later uses could race}}
   useValue(s) // expected-note {{use here could race}}
 }
@@ -45,14 +45,14 @@ func funcTestTransferringResult() async {
   // Just to show that without the transferring param, we generate diagnostics.
   let x2 = NSObject()
   let y2 = returnNSObjectFromGlobalFunction(x2)
-  await transferToMain(x2) // expected-error {{transferring 'x2' may cause a race}}
+  await transferToMain(x2) // expected-error {{transferring 'x2' may cause a data race}}
   // expected-note @-1 {{transferring disconnected 'x2' to main actor-isolated callee could cause races in between callee main actor-isolated and local nonisolated uses}}
   useValue(y2) // expected-note {{use here could race}}
 }
 
 func funcTestTransferringArg() async {
   let x = NSObject()
-  transferNSObjectToGlobalFunction(x) // expected-error {{transferring 'x' may cause a race}}
+  transferNSObjectToGlobalFunction(x) // expected-error {{transferring 'x' may cause a data race}}
   // expected-note @-1 {{'x' used after being passed as a transferring parameter; Later uses could race}}
   useValue(x) // expected-note {{use here could race}}
 }

test/Concurrency/async_task_locals_basic_warnings_bug_isolation.swift

@@ -18,7 +18,7 @@ actor Test {
                      _ body: (consuming NonSendableValue, isolated (any Actor)?) -> Void) async {
     Self.$local.withValue(12) {
       // Unexpected errors here:
-      //  error: unexpected warning produced: transferring 'body' may cause a race; this is an error in the Swift 6 language mode
+      //  error: unexpected warning produced: transferring 'body' may cause a data race; this is an error in the Swift 6 language mode
       //  error: unexpected note produced: actor-isolated 'body' is captured by a actor-isolated closure. actor-isolated uses in closure may race against later nonisolated uses
       body(NonSendableValue(), isolation)
     }

test/Concurrency/experimental_feature_strictconcurrency.swift

@@ -31,7 +31,7 @@ func iterate(stream: AsyncStream<Int>) async {
   // FIXME: Region isolation should consider a value from a 'nonisolated(unsafe)'
   // declaration to be in a disconnected region
 
-  // expected-region-isolation-warning @+3 {{transferring 'it' may cause a race}}
+  // expected-region-isolation-warning @+3 {{transferring 'it' may cause a data race}}
   // expected-region-isolation-note @+2 {{transferring disconnected 'it' to nonisolated callee could cause races in between callee nonisolated and local main actor-isolated uses}}
   // expected-region-isolation-note @+1 {{use here could race}}
   while let element = await it.next() {

test/Concurrency/isolated_captures.swift

@@ -40,7 +40,7 @@ class NotSendable {
   MyActor.ns = ns
 
   await { @YourActor in
-    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a race}}
+    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a data race}}
     // expected-region-isolation-note @+2 {{global actor 'MyActor'-isolated 'ns' is captured by a global actor 'YourActor'-isolated closure. global actor 'YourActor'-isolated uses in closure may race against later global actor 'MyActor'-isolated uses}}
     // expected-complete-warning@+1 {{capture of 'ns' with non-sendable type 'NotSendable' in an isolated closure; this is an error in the Swift 6 language mode}}
     YourActor.ns = ns
@@ -62,7 +62,7 @@ class NotSendable {
   ns.stash()
 
   await { @YourActor in
-    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a race}}
+    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a data race}}
     // expected-region-isolation-note @+2 {{global actor 'MyActor'-isolated 'ns' is captured by a global actor 'YourActor'-isolated closure. global actor 'YourActor'-isolated uses in closure may race against later global actor 'MyActor'-isolated uses}}
     // expected-complete-warning@+1 {{capture of 'ns' with non-sendable type 'NotSendable' in an isolated closure; this is an error in the Swift 6 language mode}}
     YourActor.ns = ns
@@ -83,7 +83,7 @@ class NotSendable {
   let ns = NotSendable()
 
   await { @YourActor in
-    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a race}}
+    // expected-region-isolation-warning @+3 {{transferring 'ns' may cause a data race}}
     // expected-region-isolation-note @+2 {{global actor 'MyActor'-isolated 'ns' is captured by a global actor 'YourActor'-isolated closure. global actor 'YourActor'-isolated uses in closure may race against later global actor 'MyActor'-isolated uses}}
     // expected-complete-warning@+1 {{capture of 'ns' with non-sendable type 'NotSendable' in an isolated closure; this is an error in the Swift 6 language mode}}
     YourActor.ns = ns

test/Concurrency/sendable_checking.swift

@@ -96,7 +96,7 @@ public actor MyActor: MyProto {
 
   func g(ns1: NS1) async {
     await nonisolatedAsyncFunc1(ns1) // expected-targeted-and-complete-warning{{passing argument of non-sendable type 'NS1' outside of actor-isolated context may introduce data races}}
-    // expected-tns-warning @-1 {{transferring 'ns1' may cause a race}}
+    // expected-tns-warning @-1 {{transferring 'ns1' may cause a data race}}
     // expected-tns-note @-2 {{transferring actor-isolated 'ns1' to nonisolated callee could cause races between nonisolated and actor-isolated uses}}
     _ = await nonisolatedAsyncFunc2() // expected-warning{{non-sendable type 'NS1' returned by implicitly asynchronous call to nonisolated function cannot cross actor boundary}}
   }
@@ -253,12 +253,12 @@ final class NonSendable {
   func call() async {
     await update()
     // expected-targeted-and-complete-warning @-1 {{passing argument of non-sendable type 'NonSendable' into main actor-isolated context may introduce data races}}
-    // expected-tns-warning @-2 {{transferring 'self' may cause a race}}
+    // expected-tns-warning @-2 {{transferring 'self' may cause a data race}}
     // expected-tns-note @-3 {{transferring task-isolated 'self' to main actor-isolated callee could cause races between main actor-isolated and task-isolated uses}}
 
     await self.update()
     // expected-targeted-and-complete-warning @-1 {{passing argument of non-sendable type 'NonSendable' into main actor-isolated context may introduce data races}}
-    // expected-tns-warning @-2 {{transferring 'self' may cause a race}}
+    // expected-tns-warning @-2 {{transferring 'self' may cause a data race}}
     // expected-tns-note @-3 {{transferring task-isolated 'self' to main actor-isolated callee could cause races between main actor-isolated and task-isolated uses}}
 
     _ = await x
@@ -277,7 +277,7 @@ func testNonSendableBaseArg() async {
   let t = NonSendable()
   await t.update()
   // expected-targeted-and-complete-warning @-1 {{passing argument of non-sendable type 'NonSendable' into main actor-isolated context may introduce data races}}
-  // expected-tns-warning @-2 {{transferring 't' may cause a race}}
+  // expected-tns-warning @-2 {{transferring 't' may cause a data race}}
   // expected-tns-note @-3 {{transferring disconnected 't' to main actor-isolated callee could cause races in between callee main actor-isolated and local nonisolated uses}}
 
   _ = await t.x
@@ -297,13 +297,13 @@ func callNonisolatedAsyncClosure(
 ) async {
   await g(ns)
   // expected-targeted-and-complete-warning @-1 {{passing argument of non-sendable type 'NonSendable' outside of main actor-isolated context may introduce data races}}
-  // expected-tns-warning @-2 {{transferring 'ns' may cause a race}}
+  // expected-tns-warning @-2 {{transferring 'ns' may cause a data race}}
   // expected-tns-note @-3 {{transferring main actor-isolated 'ns' to nonisolated callee could cause races between nonisolated and main actor-isolated uses}}
 
   let f: (NonSendable) async -> () = globalSendable // okay
   await f(ns)
   // expected-targeted-and-complete-warning@-1 {{passing argument of non-sendable type 'NonSendable' outside of main actor-isolated context may introduce data races}}
-  // expected-tns-warning @-2 {{transferring 'ns' may cause a race}}
+  // expected-tns-warning @-2 {{transferring 'ns' may cause a data race}}
   // expected-tns-note @-3 {{transferring main actor-isolated 'ns' to nonisolated callee could cause races between nonisolated and main actor-isolated uses}}
 }
 

test/Concurrency/transfernonsendable.sil

@@ -226,7 +226,7 @@ bb0(%0 : @guaranteed $NonSendableStruct):
   debug_value %0 : $NonSendableStruct, var, name "myname"
   %2 = struct_extract %0 : $NonSendableStruct, #NonSendableStruct.ns
   %3 = copy_value %2 : $NonSendableKlass
-  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a race}}
+  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a data race}}
   // expected-note @-1 {{task-isolated 'myname.ns' cannot be a transferring result. task-isolated uses may race with caller uses}}
 }
 
@@ -235,7 +235,7 @@ bb0(%0 : @guaranteed $MainActorIsolatedStruct):
   debug_value %0 : $MainActorIsolatedStruct, var, name "myname"
   %2 = struct_extract %0 : $MainActorIsolatedStruct, #MainActorIsolatedStruct.ns
   %3 = copy_value %2 : $NonSendableKlass
-  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a race}}
+  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a data race}}
   // expected-note @-1 {{main actor-isolated 'myname.ns' cannot be a transferring result. main actor-isolated uses may race with caller uses}}
 }
 
@@ -244,7 +244,7 @@ bb0(%0 : $*MainActorIsolatedStruct):
   debug_value %0 : $*MainActorIsolatedStruct, var, name "myname"
   %2 = struct_element_addr %0 : $*MainActorIsolatedStruct, #MainActorIsolatedStruct.ns
   %3 = load [copy] %2 : $*NonSendableKlass
-  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a race}}
+  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.ns' may cause a data race}}
   // expected-note @-1 {{main actor-isolated 'myname.ns' cannot be a transferring result. main actor-isolated uses may race with caller uses}}
 }
 
@@ -253,7 +253,7 @@ bb0(%0 : @guaranteed $MainActorIsolatedEnum):
   debug_value %0 : $MainActorIsolatedEnum, var, name "myname"
   %2 = unchecked_enum_data %0 : $MainActorIsolatedEnum, #MainActorIsolatedEnum.second!enumelt
   %3 = copy_value %2 : $NonSendableKlass
-  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.second' may cause a race}}
+  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.second' may cause a data race}}
   // expected-note @-1 {{main actor-isolated 'myname.second' cannot be a transferring result. main actor-isolated uses may race with caller uses}}
 }
 
@@ -262,7 +262,7 @@ bb0(%0 : $*MainActorIsolatedEnum):
   debug_value %0 : $*MainActorIsolatedEnum, var, name "myname"
   %2 = unchecked_take_enum_data_addr %0 : $*MainActorIsolatedEnum, #MainActorIsolatedEnum.second!enumelt
   %3 = load [take] %2 : $*NonSendableKlass
-  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.second' may cause a race}}
+  return %3 : $NonSendableKlass // expected-warning {{transferring 'myname.second' may cause a data race}}
   // expected-note @-1 {{main actor-isolated 'myname.second' cannot be a transferring result. main actor-isolated uses may race with caller uses}}
 }
 
@@ -281,7 +281,7 @@ bb2(%1 : @guaranteed $NonSendableKlass):
   br bb3(%3 : $FakeOptional<NonSendableKlass>)
 
 bb3(%4 : @owned $FakeOptional<NonSendableKlass>):
-  return %4 : $FakeOptional<NonSendableKlass> // expected-warning {{transferring 'myname.some' may cause a race}}
+  return %4 : $FakeOptional<NonSendableKlass> // expected-warning {{transferring 'myname.some' may cause a data race}}
   // expected-note @-1 {{main actor-isolated 'myname.some' cannot be a transferring result. main actor-isolated uses may race with caller uses}}
 }