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entity bug is
port (
clk : in bit
);
end bug;
architecture struct of bug is
type data_t is record
value : natural;
end record;
type offset_array_t is array(natural range<>) of natural;
type data_array_t is array(natural range<>) of data_t;
type collection_t is record
offset : offset_array_t;
data : data_array_t;
end record;
-- This results in an error
function append(prefix : collection_t; data : data_array_t) return collection_t is
begin
return (offset => prefix.offset & prefix.data'length,
data => prefix.data & data);
end function;
-- This works as a workaround
function append2(prefix : collection_t; data : data_array_t) return collection_t is
variable ret : collection_t(offset(0 to prefix.offset'length), data(0 to prefix.data'length+data'length-1));
begin
ret := (offset => prefix.offset & prefix.data'length,
data => prefix.data & data);
return ret;
end function;
--intentional null ranges for the initial value
constant initial_collection : collection_t(offset(0 to -1), data(0 to -1)) := (offset => (others => 0), data => (others => (value => 0)));
constant new_data : data_array_t(0 to 2) := (others => (value => 0));
constant final_collection : collection_t := append(initial_collection, new_data);
begin
end architecture;
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