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a4f323ce9c
Suggest creating unary tuples when types don't match a trait
When you want to have a variadic function, a common workaround to implement this is to create a trait and then implement that trait for various tuples. For example in `pyo3` there exists
```rust
/// Calls the object with only positional arguments.
pub fn call1(&self, args: impl IntoPy<Py<PyTuple>>) -> PyResult<&PyAny> {
...
}
```
with various impls like
```rust
impl<A: IntoPy<PyObject> IntoPy<Py<PyAny>> for (A,)
impl<A: IntoPy<PyObject, B: IntoPy<PyObject> IntoPy<Py<PyAny>> for (A, B)
... etc
```
This means that if you want to call the method with a single item you have to create a unary tuple, like `(x,)`, rather than just `x`.
This PR implements a suggestion to do that, if applicable.
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|---|---|---|
| .. | ||
| auxiliary | ||
| bad-annotation.rs | ||
| bad-annotation.stderr | ||
| expected-comma-found-token.rs | ||
| expected-comma-found-token.stderr | ||
| feature-gate-on-unimplemented.rs | ||
| feature-gate-on-unimplemented.stderr | ||
| impl-substs.rs | ||
| impl-substs.stderr | ||
| issue-104140.rs | ||
| issue-104140.stderr | ||
| multiple-impls.rs | ||
| multiple-impls.stderr | ||
| no-debug.rs | ||
| no-debug.stderr | ||
| on-impl.rs | ||
| on-impl.stderr | ||
| on-trait.rs | ||
| on-trait.stderr | ||
| parent-label.rs | ||
| parent-label.stderr | ||
| slice-index.rs | ||
| slice-index.stderr | ||
| suggest_tuple_wrap_root_obligation.rs | ||
| suggest_tuple_wrap_root_obligation.stderr | ||
| suggest_tuple_wrap.rs | ||
| suggest_tuple_wrap.stderr | ||
| sum.rs | ||
| sum.stderr | ||