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An expression specifies an address or numeric value. Whitespace may precede and/or follow an expression.
The result of an expression must be an absolute number, or else an offset into
a particular section. If an expression is not absolute, and there is not
enough information when as sees the expression to know its
section, a second pass over the source program might be necessary to interpret
the expression—but the second pass is currently not implemented.
as aborts with an error message in this situation.