w <= (a=b) = (c=d);
x <= (a=b) = mvl4'(c=d);
y <= (a=b) = bit'(c=d);
z <= (a=b) = boolean'(c=d);
The type of the individual return value is explicitly
selected by the qualified expressions. Thus, the
corresponding `=`-function is selected as well.
CASE vec_type'(A & B) is
when "00" => VALUE <= 0;
when "01" => VALUE <= 1;
when "10" => VALUE <= 2;
when "11" => VALUE <= 3;
when others => VALUE <= 9;
end case;
The qualified expression merges two single bit types
to a vector with the (sub-) type vec_type. The value of
this newly formed vector is examined in the case assignment