Main-locked threads are panic wrapped

phases.go

@@ -234,9 +234,9 @@ func (this *environment) phase70Running() bool {
 		}
 	}
 	
-	result := make(chan bool)
+	bodyReturn := make(chan bool)
 	go func() {
-		result <- this.phase70RunningBody()
+		bodyReturn <- this.phase70RunningBody()
 		if this.main != nil {
 			shutdownCtx, done := context.WithTimeout(
 				context.Background(),
@@ -247,19 +247,12 @@ func (this *environment) phase70Running() bool {
 		}
 	}()
 
+	mainReturn := false
 	if this.main != nil {
-		mainActor := this.main.(Actor)
+		mainReturn = this.phase70_2MainBind()
-		if this.Verb() { log.Printf("(i) (70) binding %s to main thread", mainActor.Type()) }
-		runtime.LockOSThread()
-		defer runtime.UnlockOSThread()
-		err := this.main.RunMain()
-		if err != nil {
-			log.Printf("XXX [%s] main thread failed: %v", mainActor.Type(), err)
-		}
-		if this.Verb() { log.Printf("(i) (70) main thread exited") }
 	}
 	
-	return <- result
+	return <- bodyReturn && mainReturn
 }
 
 func (this *environment) phase70RunningBody() bool {
@@ -294,6 +287,21 @@ func (this *environment) phase70RunningBody() bool {
 	return true
 }
 
+func (this *environment) phase70_2MainBind() bool{
+	mainActor := this.main.(Actor)
+	if this.Verb() { log.Printf("... (70.2) binding %s to main thread", mainActor.Type()) }
+	runtime.LockOSThread()
+	if this.Verb() { log.Printf(".// (70.2) main thread bind complete") }
+	defer runtime.UnlockOSThread()
+	err := panicWrap(this.main.RunMain)
+	if err != nil {
+		log.Printf("XXX [%s] main thread failed: %v", mainActor.Type(), err)
+		return false
+	}
+	if this.Verb() { log.Printf("(i) (70.2) main thread exited") }
+	return true
+}
+
 func (this *environment) phase70_5Trimming() bool {
 	if this.Verb() { log.Println("... (70.5) trimming") }
 	var trimmable []Trimmable

util.go

@@ -14,16 +14,34 @@ import "sync/atomic"
 import "unicode/utf8"
 import "runtime/debug"
 
-func panicErr(message any, stack []byte) (err error) {
+type panicError struct {
-	if panErr, ok := message.(error); ok {
+	wrapped error
-		err = panErr
+	stack   []byte
+}
+
+func (this panicError) Error() string {
+	if this.stack == nil {
+		return this.wrapped.Error()
 	} else {
-		err = errors.New(fmt.Sprint(message))
+		return fmt.Sprintf("%v: %s", this.wrapped, this.stack)
 	}
-	if stack != nil {
-		err = fmt.Errorf("%w: %s", err, stack)
 }
-	return err
+
+func (this panicError) Unwrap() error {
+	return this.wrapped
+}
+
+func panicErr(message any, stack []byte) (err error) {
+	var wrapped error
+	if panErr, ok := message.(error); ok {
+		wrapped = panErr
+	} else {
+		wrapped = errors.New(fmt.Sprint(message))
+	}
+	return panicError {
+		wrapped: wrapped,
+		stack:   stack,
+	}
 }
 
 func defaul[T comparable](value, def T) T {