Derive macro doesn't keep the struct's generics

[ADD-SP]

For this code snippet

struct CpuUsageLabelsSet<'a> {
    mode: CpuMode,   // <- an enum
    service: &'a str,
}

which emits compilation error

error[E0726]: implicit elided lifetime not allowed here
  --> xxxxx
   |
48 | struct CpuUsageLabelSet<'a> { // <-- `'a` lifetime is used in the struct,
   |        ^^^^^^^^^^^^^^^^ expected lifetime parameter
   |
help: indicate the anonymous lifetime
   |
48 | struct CpuUsageLabelSet<'_><'a> { // <-- `'a` lifetime is used in the struct,
   |                        ++++