type inference - Unifying len and S len would lead to infinite value -


i trying make function hpure generates hvect repeating same element until reaches required length. each element may have different type. ex: if argument show each element specialization of show function.

hpure show : hvect [int -> string, string -> string, somerandomshowabletype ->  string]

this attempt:

hpure : {outs : vect k type} -> ({a : _} -> {auto p : elem outs} -> a) -> hvect outs hpure {outs = []} _ = [] hpure {outs = _ :: _ } v = v :: hpure v

this error occurs on final v:

when checking application of main.hpure:         unifying len , s len lead infinite value

why error occur , how can fix it?

the issue type of v depends on outs, , recursive call hpure passes tail of outs. v needs adjusted well.

the error saying lengths of outs , tail have same in order version typecheck.

here version typechecks.

hpure : {outs : vect k type} -> ({a : type} -> {auto p : elem outs} -> a) -> hvect outs hpure {outs = []} _ = [] hpure {outs = _ :: _} v = v here :: hpure (\p => v (there p))

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