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9.2.3.4 Logical Operators
Except when they appear in the condition operand of a COND_EXPR,
logical `and' and `or' operators are simplified as follows:
a = b && c becomes
T1 = (bool)b;
if (T1)
T1 = (bool)c;
a = T1;
Note that T1 in this example cannot be an expression temporary,
because it has two different assignments.