为什么在没有块的情况下调用eval会终止这个Perl程序？

Question

以下程序在第二次调用eval时停止.这是预期的吗？我读了perldoc -f eval,并且惊讶于没有显示打印"2:..."的输出.

eval {die("The curly braces seem to rescue me! Life moves on")};
print "1: $@\n";
eval die("Program actually terminates here! Subsequent prints are not shown");
print "2: $@\n";

Answer 1

perldoc -f eval

eval EXPR
eval BLOCK
eval    In the first form, often referred to as a "string eval", the
        return value of EXPR is parsed and executed as if it were a little
        Perl program.

... die调用它然后评估它返回的字符串.

...除了它不返回一个字符串.它使程序死亡,因此eval永远不会被调用.