Comment by sparkie

Defer is a restricted form of COMEFROM with automatic labels. You COMEFROM the end of the next `defer` block in the same scope, or from the end of the function (before `return`) if there is no more `defer`. The order of execution of defer-blocks is backwards (bottom-to-top) rather than the typical top-to-bottom.

    puts("foo");
    defer { puts("bar"); }
    puts("baz");
    defer { puts("qux"); }
    puts("corge");
    return;

Will evaluate:

    puts("foo");
    puts("baz");
    puts("corge");
    puts("qux");
    puts("bar");
    return;