How do I rethrow an exception and preserve the stack trace?

Question

This code:

try {   try {     throw 1;   } catch (e, s) {     print("$e $s");     throw e;   } } catch (e2, s2) {   print("$e2 $s2");     } 

prints:

1 #0      main (file:///.../test.dart:34:7)  1 #0      main (file:///.../test.dart:37:7) 

So the original stack trace is completely lost. Is there any way to rethrow with the stack trace preserved?

Answer 1

Current versions of the Dart VM and dart2js support rethrowing, preserving the stack trace, with rethrow:

void main() {   try {     try {       throw 1;     } catch (e, s) {       print("$e $s");       rethrow;     }   } catch (e2, s2) {     print("$e2 $s2");       } } 

This produces:

 1 #0      main (file:///home/darshan/so/stacktrace.dart:4:7)  1 #0      main (file:///home/darshan/so/stacktrace.dart:4:7) #1      main (file:///home/darshan/so/stacktrace.dart:7:7)