Hi,

In [expr.const] p.154:

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An expression or conversion is immediate-escalating if it is not initially in an
immediate function context and it is either

— a potentially-evaluated id-expression that denotes an immediate function that
is not a subexpression of an immediate invocation, or ...
------------------------------------------------

I don't understand "is not a subexpression of an immediate invocation".

It seems redundant because the clause starts with "if it is not initially in an
immediate function context".