[basic.indet] Convert reference to [conv.lval] into note

Author: eisenwave

source/basic.tex

@@ -4149,7 +4149,11 @@
 If any bit in the value representation has an indeterminate value,
 the object has an indeterminate value;
 otherwise, if any bit in the value representation has an erroneous value,
-the object has an erroneous value\iref{conv.lval}.
+the object has an erroneous value.
+\begin{note}
+Lvalue-to-rvalue conversion has undefined behavior
+if the erroneous value of an object is not valid for its type\iref{conv.lval}.
+\end{note}
 \begin{note}
 Objects with static or thread storage duration are zero-initialized,
 see~\ref{basic.start.static}.