Perfect! Change 
-$obj->lf_int=444;
+sub lf_int :lvalue { $obj->lf_int }
+lf_int=444;

[download]
and you get 
Can't return a temporary from lvalue subroutine

[download]

That's the bug. It's a spurious exception (not a warning!) when the temp has set magic.

Obscure, yes, but I want to change the lvalue ops to return a temp which would cause the following to give the same error: 

sub foo :lvalue { substr(...) }

[download]

In reply to Re^2: lvalue XS subs by ikegami
in thread lvalue XS subs by ikegami

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