In [conv.lval] p3.4, the result of lvalue-to-rvalue conversion is described as follows: Otherwise, the object indicated by the glvalue is read ([defns.access]), and the value contained in the obje...

In C++26, reading uninitialized variables is no longer undefined, it's "erroneous" now (What is erroneous behavior? How is it different from undefined behavior?). However, the wording for...

C++26 has introduced erroneous behavior in addition to undefined, unspecified, and implementation-defined behavior (see Undefined, unspecified and implementation-defined behavior). How is this new ...