ParseResult.apply_err

Transform func that takes a E into a function that takes a ParseResult

struct ParseResult(R, T = void, E = ulong)
@safe @trusted static
apply_err
(
alias func
)
(
auto ref ParseResult!(R, T, E) i
)
if (
is(typeof(func(i.e_)))
)
if (
isForwardRange!R &&
!is(E : R)
&&
)

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