Getting an error using lifetimes in struct using Task

[TJ-alchemist]

Error: return type references an anonymous lifetime, which is not constrained by the fn input types
I'm getting this error in export_task! macro.

These are the notes from the compiler.

= note: lifetimes appearing in an associated type are not considered constrained
= note: this error originates in the macro `$crate::export_task` (in Nightly builds, run with -Z macro-backtrace for more info)

[Michael-F-Bryan]

Are you trying to return something which borrows from the inputs (i.e. -> Foo<'_>)?

You can also use cargo expand to see what code the export_task!() macro is generating, which should help troubleshoot the error.