Using inline trait bounds instead of a where clause triggers build failure

[gshep]

Problem

Inline trait bound for a service - impl<T: TestTrait> TestTraitBoundsService<T> - fails to compile. Log attached.

Steps

1. cargo-sails new-program test-trait-bounds

struct TestTraitBoundsService<T>(PhantomData<T>);

trait TestTrait {}

impl TestTrait for u8 {}

#[sails_rs::service]
impl<T: TestTrait> TestTraitBoundsService<T> /* ... */

// Exposed service
    pub fn test_trait_bounds(&self) -> TestTraitBoundsService<u8> {
        TestTraitBoundsService::new()
    }

4. cargo test

Possible Solution

No response

Notes

No response

Relevant Log Output

cargo test output

$ cargo test
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
   Compiling test-trait-bounds-app v0.1.0 (/home/user/devel/gear-tech/sails/test-trait-bounds/app)
error[E0599]: the method `do_something` exists for struct `Box<TestTraitBoundsService<T>>`, but its trait bounds were not satisfied
  --> app/src/lib.rs:20:12
   |
20 |     pub fn do_something(&mut self) -> String {
   |            ^^^^^^^^^^^^ method cannot be called on `Box<TestTraitBoundsService<T>>` due to unsatisfied trait bounds
   |
note: trait bound `T: TestTrait` was not satisfied
  --> app/src/lib.rs:13:9
   |
13 | impl<T: TestTrait> TestTraitBoundsService<T>
   |         ^^^^^^^^^  -------------------------
   |         |
   |         unsatisfied trait bound introduced here

For more information about this error, try `rustc --explain E0599`.
error: could not compile `test-trait-bounds-app` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `test-trait-bounds-app` (lib) due to 1 previous error