We can throw an exception but we cannot deoptimize at a runtime call.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
===================================================================
--- runtime/vm/il_printer.cc	(revision 11688)
+++ runtime/vm/il_printer.cc	(working copy)
@@ -537,12 +537,12 @@
 
 
 void ThrowInstr::PrintTo(BufferFormatter* f) const {
-  f->Print("    %s:%d ", DebugName(), deopt_id());
+  f->Print("    %s" , DebugName());
 }
 
 
 void ReThrowInstr::PrintTo(BufferFormatter* f) const {
-  f->Print("    %s:%d ", DebugName(), deopt_id());
+  f->Print("    %s ", DebugName());
 }
 
 
@@ -779,12 +779,12 @@
 
 
 void ThrowInstr::PrintToVisualizer(BufferFormatter* f) const {
-  f->Print("_ %s:%d ", DebugName(), deopt_id());
+  f->Print("_ %s ", DebugName());
 }
 
 
 void ReThrowInstr::PrintToVisualizer(BufferFormatter* f) const {
-  f->Print("_ %s:%d ", DebugName(), deopt_id());
+  f->Print("_ %s ", DebugName());
 }