Make SequenceWriter generic over Error type

[facutuesca]

(see #597 (comment))

[alex]

Hmm, is it not able to infer the type even when its the default?

[facutuesca]

Hmm, is it not able to infer the type even when its the default?

doesn't seem so:

error[E0283]: type annotations needed
   --> examples/no_std.rs:20:26
    |
20  |         w.write_element(&asn1::SequenceWriter::new(&|w: &mut asn1::Writer| {
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `E` declared on the struct `SequenceWriter`
    |
    = note: cannot satisfy `_: From<WriteError>`
note: required by a bound in `asn1::write`
   --> /Users/facu/repos/rust-asn1/src/writer.rs:210:17
    |
210 | pub fn write<E: From<WriteError>, F: Fn(&mut Writer<'_>) -> Result<(), E>>(
    |                 ^^^^^^^^^^^^^^^^ required by this bound in `write`
help: consider specifying the generic argument
    |
20  -         w.write_element(&asn1::SequenceWriter::new(&|w: &mut asn1::Writer| {
20  +         w.write_element(&asn1::SequenceWriter::<E>(&|w: &mut asn1::Writer| {
    |

[alex]

🙃 what's the point of the default if it doesn't work in this situation?

[facutuesca]

🙃 what's the point of the default if it doesn't work in this situation?

yeah. Looks related to this: rust-lang/rust#98931

edit: also rust-lang/rust#27336