[Merged by Bors] - fix: use explicit Result type from std on generated code

[morenol]

this is done in order to avoid issues that could happen if a different Result type is on scope

[morenol]

First commit fails with

test ui-tests/pass_derive_decode_encode_with_custom_results.rs ... error
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
error[E0107]: type alias takes 0 generic arguments but 2 generic arguments were supplied
 --> ui-tests/pass_derive_decode_encode_with_custom_results.rs:7:19
  |
7 | #[derive(Default, Decoder, Encoder)]
  |                   ^^^^^^^- help: remove these generics
  |                   |
  |                   expected 0 generic arguments
  |
note: type alias defined here, with 0 generic parameters
 --> ui-tests/pass_derive_decode_encode_with_custom_results.rs:3:10
  |
3 | pub type Result = std::result::Result<(), ()>;
  |          ^^^^^^
  = note: this error originates in the derive macro `Decoder` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0107]: type alias takes 0 generic arguments but 2 generic arguments were supplied
 --> ui-tests/pass_derive_decode_encode_with_custom_results.rs:7:28
  |
7 | #[derive(Default, Decoder, Encoder)]
  |                            ^^^^^^^- help: remove these generics
  |                            |
  |                            expected 0 generic arguments
  |
note: type alias defined here, with 0 generic parameters
 --> ui-tests/pass_derive_decode_encode_with_custom_results.rs:3:10
  |
3 | pub type Result = std::result::Result<(), ()>;
  |          ^^^^^^
  = note: this error originates in the derive macro `Encoder` (in Nightly builds, run with -Z macro-backtrace for more info)
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

[sehz]

LGTM

[morenol]

bors r+

[bors]

Build failed:

• Done

[morenol]

bors r+

[bors]

Build failed:

• Done

[morenol]

ohh clippy issues from new version

[morenol]

bors retry

[bors]

Pull request successfully merged into master.

Build succeeded!

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• Done