[Moderator's note: this defect report has been forwarded to
 the C++ committee.  -moderator (fjh).]

In 5.17 [expr.ass] it says:
 >>
If the left operand is not of class type, the expression is implicitly
converted (clause 4) to the cv-unqualified type of the left operand.
<<

It's not clear if this sentence applies only to simple assignment (=) or
all assignment operators (= *= /= %= += -= >>= <<= &= ^= |=).  In C (and
all the C++ compilers I have access to) it's clear that the sentence above
only applies to simple assignment.
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