Surya,
The "automatic compatibility" issue is irrelevant to your original topic of this thread, which was the "type of a concat expression", because a concatenation is a primary, and the type and evaluation of a primary, unless it is of the form ( mintypmax_expression ), are immune to the statement context in which it is embedded.
Do you feel certain now about the type of a concatenation? If not, which questions about it do you still consider unresolved?
-- Brad
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