der: add Error::(set_)source
; remove Clone
+ Copy
#1328
Merged
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When the
std
feature is enabled, adds support for propagating an arbitrary error source which can be set usingError::set_source
.The main use case is passing back an arbitrary error value in the
ErrorKind::Value
use case, to handle passing back what specifically was wrong with a given value in a DER-encoded document.This entails removing the
Clone
+Copy
bounds since the error is stored in aBox
, which can't beCopy
and can't reflect aClone
bound. Fortunately, nothing in this repo ever seems to clone anError
so it's not really an issue.Also adds
Error::source
impls to the downstream error types inpkcs1
,pkcs5
,pkcs8
,sec1
, andspki
.