Visual Studio, PHP, Xdebug: Error evaluating code while debugging

The base64 decode of that string results in:

eval("try { return  1 + 1; }catch (Throwable $t){ return new DevsenseEvalError($t->getMessage());}catch (Exception $e){ return new DevsenseEvalError($e->getMessage());}");

Which can't really work, as you haven't escaped the $t in catch (Throwable $t) for example, and that throws a warning and a parse error when you run this with normal PHP:

Warning: Undefined variable $t in /tmp/foo.php on line 2

Warning: Undefined variable $t in /tmp/foo.php on line 2

Warning: Attempt to read property "getMessage" on null in /tmp/foo.php on line 2

Warning: Undefined variable $e in /tmp/foo.php on line 2

Warning: Undefined variable $e in /tmp/foo.php on line 2

Warning: Attempt to read property "getMessage" on null in /tmp/foo.php on line 2

Parse error: syntax error, unexpected token ")" in /tmp/foo.php(2) : eval()'d code on line 1

It seems likely that Devsense (I don't know what that is) is throwing a spanner in the works, as it literally just should send MSsx (base 64 encoded form of 1+1).