Changed Windows sysData.setText() to panic on error. WM_SETTEXT's documentation indicates the main error is memory exhausted, which means we should panic anyway (unless the Go runtime already has). Any other error will be flagged as unexpected; since we're using SetWindowText() we can't differentiate between out of memory and other errors in the way WM_SETTEXT documents anyway.

sysdata_windows.go

@@ -254,7 +254,7 @@ func (s *sysData) setText(text string) error {
 	}
 	r := <-ret
 	if r.ret == 0 {		// failure
-		return r.err
+		panic(fmt.Errorf("error setting window/control text: %v", err))
 	}
 	return nil
 }