try_v2 0.4.0

Provides a derive macro for `Try` ([try_trait_v2](https://rust-lang.github.io/rfcs/3058-try-trait-v2.html))
Documentation 
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error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:7:10
   |
 7 | #[derive(Try, Try_ConvertResult)]
   |          ^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:9:21
   |
 9 | enum TooManyOutputs<T, E> {
   |                     ^
help: change this to (T)
  --> tests/compilation/fail_TooManyOutputs.rs:10:7
   |
10 |     Ok(T, E),
   |       ^^^^^^
   = note: this error originates in the derive macro `Try` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:7:15
   |
 7 | #[derive(Try, Try_ConvertResult)]
   |               ^^^^^^^^^^^^^^^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:9:21
   |
 9 | enum TooManyOutputs<T, E> {
   |                     ^
help: change this to (T)
  --> tests/compilation/fail_TooManyOutputs.rs:10:7
   |
10 |     Ok(T, E),
   |       ^^^^^^
   = note: this error originates in the derive macro `Try_ConvertResult` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:14:10
   |
14 | #[derive(Try, Try_ConvertResult)]
   |          ^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:16:37
   |
16 | enum TooManyOutputsBorrowed<'t, 'e, T, E> {
   |                                     ^
help: change this to (&'t T)
  --> tests/compilation/fail_TooManyOutputs.rs:17:7
   |
17 |     Ok(&'t T, &'e E),
   |       ^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Try` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:14:15
   |
14 | #[derive(Try, Try_ConvertResult)]
   |               ^^^^^^^^^^^^^^^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:16:37
   |
16 | enum TooManyOutputsBorrowed<'t, 'e, T, E> {
   |                                     ^
help: change this to (&'t T)
  --> tests/compilation/fail_TooManyOutputs.rs:17:7
   |
17 |     Ok(&'t T, &'e E),
   |       ^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Try_ConvertResult` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:21:10
   |
21 | #[derive(Try, Try_ConvertResult)]
   |          ^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:23:45
   |
23 | enum TooManyOutputsBorrowedOrdering<'e, 't, T, E> {
   |                                             ^
help: change this to (&'t T)
  --> tests/compilation/fail_TooManyOutputs.rs:24:7
   |
24 |     Ok(&'e E, &'t T),
   |       ^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Try` (in Nightly builds, run with -Z macro-backtrace for more info)

error: Try requires a single generic type for `Output`
  --> tests/compilation/fail_TooManyOutputs.rs:21:15
   |
21 | #[derive(Try, Try_ConvertResult)]
   |               ^^^^^^^^^^^^^^^^^
   |
help: Output type defined here
  --> tests/compilation/fail_TooManyOutputs.rs:23:45
   |
23 | enum TooManyOutputsBorrowedOrdering<'e, 't, T, E> {
   |                                             ^
help: change this to (&'t T)
  --> tests/compilation/fail_TooManyOutputs.rs:24:7
   |
24 |     Ok(&'e E, &'t T),
   |       ^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Try_ConvertResult` (in Nightly builds, run with -Z macro-backtrace for more info)